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1 communication by giv eee 
4 of i progress abe deen pe u K ert 
14 have; divided it into ace The 
tions. of the sides of the e and 
NGATY triar les extended over the country in 1797; 1798, 
2789 ; together With an account: of ebene . 
| — . line on fas rnd and a short historical narrative ot 


T7; 


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| g abs. captains. the (directions) af those 
riding; ang on Black Down, in Dorgetthite; another cir But- 
terton Hill, in Devonshire; and another on St. Agnes Beacon, 


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| myoel with | m 


| ah hun- 88 


The Account of a 


1 Cornwall Among the contents are likewise to ben mbered 


the bearings, distances, &c. of the stations a1 and intersected objects, 


from the parallels and meridians LES 
The third wall Ast Fsctidn fta we trixhgles wit have. 
been cartel over r Essex, the western 1. ** of Kent, and portions 


Init“ 305 
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ormer, Su Sulfolk and e 


which concludes with the We of 1 5 stations and mean 


MOITIYUOR 141 
refractions. 


nore ne Ken 
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beläge , ; THEY 
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ticabl bar tower p 

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very considerable distance, in a direction very 


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merdon Ball, a secondary station in the series of 1795. 


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> Dluotis Mois 11 min 


; was placed on à hill called Hom- | 


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OS Rog ah. 164 26 33975 J 
TO WENT 3% - 37 35325 


an Ter and Ab wury r — 88 1855 51,½5 


98 5 ö | ® Ws; 2821 $6"! 52,75 domes A 
Pileden 45 | Abbotsbury Staff Lg * +. > 45 16 41 14, but 13 


1 1 a fpreferced. 
| Pole star and Abbotsbury staff, April 17. morning 2 104 19 26,75 | 
5 | - WP 18, morting . 104 19 19,25 | 1 5 : | 
TY J * 19, morning 104 19 33 | 
> 414, 4 Rt 19, afternoon © 98 42 2 


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75 At Butterton. 


K $ r - vi cano;f wa Nox bao p 
gs oi mp bow 5 99 Toe . - 7 7 
Eo | — 7 4 THREE 1 15 . 7 Lo n 82 9 8 
f 5 yoo | ES 5 6 | 0 
Pole rar and 4e Hommbrdon Ball,” May 6, aftertioon. 91 29 13,75 
RED . 97 4 + 
IE * 2 91 29 12 ; 
i "On St. Agnes Beacon, 
Hensbarrow and Trevose Head — .- V =—_ 
Hensbarrow and Peranzabulo staff e I3 BA ge 331 50 55,5 156, but 
e | Ce, 56,25 $55 pref. : 
Pole Star and Peranzabulo Staff, May 20, afternoon 40 4575 „ 
„„ ö | 5 21, afternoon 6, 44 © 4475 
f 70.23. C8 £01 - 22, morning 38 26 {1 1,5 Wing 1 | 4 
DTS e 5 22, afternoon <« 44 O 33, 5 | | | 


5 » hg; { 
8 38 26 . 
8 5 L 3:23 
pl 2 8 N. 3 7 * a 4 
4 . 
. 


I ; | 
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N70 * 8 is a 
St. Agnes Beacon and lesben EEE #7 + 7 | © | a OOO 
rr - - FC THOR O17 a 0 441 
„ : 


1 85 : ; 5 | 34-0 | 4 | 1 9 95 5 | © BHS | | ; | i 8 f OY 
: A PO 
Beacon and Trevose Head 


5 ; . > © 3 4s 
: ; "+ 
£6 2 — | 5 1 * f LA 2 


„ 1 x 4 a 1 f 
| * * . ; f 8 . 19 
3 i . ” * 2 3 8 ' 


wo 
CCC * 


* , # 4 1 * * $. 1 1 


9 
d 
{ 
, 


— leo 


— 


Carraton lde taff on Brown Wi 


; FE þ ; 3 5 g ; 5 ; ? 1 3 
* . * * p , . . l 5 
N , ; a 2 a8 2 | Ba ; : 
x | Cadon Barrow and staff on Brown Will „„ 
© N X Y 7 3 5 _ 2 8. 7 4 ed * oy 4 g * * * F vw 1 3 = 


4 l 
* 88 n 33 


* 


” o » . * : þ . 
. : 9 7% *% 5 ; : 
-4 ; N N 4 — £ A CY » \ Iq 
Ra | Cadon Barrow and picket on Brown Wil 
f 5 f | Ef I JT op FAb Rs LIU Se LACKS 
8 . vo. * 


* 


* 


, ; kh xd 
? VCC - e e 209794 1 ee 
1 Direction post on Bodmin Down and staff on Brown Willy. + 41 12 37.3 
f 3 4 0 * e dang bn R 
. Direction post on Bodmin Down and pic cket on Brown 140 40 34 | : 
1 8 bi 1 212 3 75 35. 5 


e \ 
4 


; no, e mr - 100 20 52,25 


| | 15 ! : 5 74 in 2 0 | WELL Uber, 9H bits: N HT ES | LC 
| on Brown-Willy and Warbstow een MEISE. LE ca _ 18 24,25 298 
x Fx ; 9 4 0 f : . : $5 25,5 we. 72 * 


- 
Ware 
I 
* 
Carraton Hill and Kit Hill 5 1 3 
58 N R 
Black Down and Kit Hill == 5 „ e 
G17 Haut 


5 


EY At Maker. 
Carraton Hill and Black Down 02; A p et An- 


14 
«| 6 = 
+. > "hs 


T . 


St. . Stephen's: 3 and Broadbury Down - 


- 


Clement aa En U VVA 


5 
9 


a Wenn. . 

er beg On the Mendip Hills, 
Dundon Beacon and Bleak . 
alt (Yin 10 


"2 
* 
— 7” 4 : 
- - = 
+ -Þ d 
£ ET” . 
* I. * 4 


Wacky 


8 
4 
* 
—_— 
1 , 
* 
3 4 
> 3 


S 3 3 &-: 


She: 39 419,6. 


. 


18,75 18,75 


VIE 19. , 
90 0 


„ l 
45 34 36 
bu #* { 


+ IF; £4.56... 


T Y 
bean 


1 7 „ 


141 nnn * 


54 16 13 


742% 5 


oO. FE 
9 425) 5 97 


! 39 44: 3 7525 


40,75 
00 49. 12925 
58,28 

13 12 58 


25 15 59,25 


5975 


n 16 Oe -' 
445 


29 11 35,75 
38 
45 
41,750 


33 39 30,5 
3055 


* 


FIT OY 
* j 


39-25 


«4s ffs 


305,5 


I 

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= * 1 
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17 
& 
438 
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77 } 
4 
1 
0 


" Ly * 2 9 4 A ++ £ N = * * 2 F1 * 4 * * 2 4 bel 
1 * — 3 : * : "RIF a As bs 8 ** 2 — * * 4 y * a. ; * 5 WW 1 7 Ts * * * : * 1 * L 
: k * I . > * % ? * 
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Beacon and I ansdown | '* 2646) rn L588 
25 x -4 = „ 28 1 * i © 
l ' e f 5 
pv by e ' 4.1% 5 s 
n W | | 0 308 
TAS 4 EDA | 
8 } 1 — . . - 5 
* je * * . * ; 7 
Lansdown and Farley Down - % ET: 
| f 5 BY 
: 8 FL : N rr 7 * * * 
: ah : g — 45 4 9 0G g 4 3 4 4 oa, 36 Pi 
: ” 1 ; ; F $ { 1 — 7 ? $, *. 1 & 14 4 „ 4 AY »& nl 5 » 
: 4 * W FI) we ER < . ; ; 2 
* 3 
p 418 © 
; : . 5 , 5 \ ; & 
KG * +4 a # 
« : ; 
* F i $4 * Eo , ＋ 
tf 1 1 7 A * * f 4 Sa 5 8 3 F va xl b. n 5 22 x at c 
. I D 0 * \ : 
: P 7. %# Fad WU 
i | bt y | 
Westb Down and Bradley Knoll - » 
5 * £ * i 'Þ 
4 "= 8. , * . N 
1 , 


ORE | | | $775 | A 
| 33 1 EY 55 AA #57 * : 3 
N ; . 8 „ 1 : F E ' ! 
* Ly 4 0 ; — ' 8 *; 1 KS EIS #4448 We BF Pp 1 . 7 MIN , 
Ry 2 — 4x ; — 15 59 


$- 4 


; SR : . . 114 4 7225 eit 
Farley Down and Dundry Beacon 60 36 15 fig 
Farley Down and Bradley Knoll — - „ 644 16 >} - 
| 18,5 19.75 5 
| a | 21 c 
Tickenham Down and Grey Hill \ - 37 44 2,251 
| 5 ; 6 6,25 8 F 


7 


Kingeweston and Grey Hill = „ n 19 23, ten 
7 . 27.75 173 


* * . . 
* * 
1 FJ af * « 4 ; 1 S > 


8 1 * * 8 ; : 
j * * # . 
* mM - ; 0 0 
9 * 
. * 
. 4 ö : . 95 —_ 
. . L * 
» ” £ * ** 4 
F # . 4 1 7 "I : 
* * 3 Na. E # ; ' 2 1 A 


Lansdown and station on the Mendip Hills *  - © 


4 1 
. } 


Farley Down and Mendip Hills * = © 


x NS 


* 5 


Mendip ip and Bleak Down © RN A 


Kingsweston and Dundry _ =. v0. 0 be 36 38 29 


— 0 | a | % | . , A jþ # 6 7 4 5 o A - * 41 1 y 4 
e 25 2 a 77% ͤ f + $493 5208 15.5 $504 oo WOLFF $2 3G: ' 
: 4 4B i . * & p T6 ; 2 7 1 
HE». arley 0 | 5 
ERA 1 1 = A FLO & . 5 5 oF 
1 $ 185 1 1 4 > N | 
St. Ang's Hill and Westbury Down 2 $1 44 10,5 | 
. $ u : - - - 51 10,75 | 
. 1 
8 Fe * - N | 
We. * * g " 5 ; 


ele e 
1 3 % 
Westbury Dbwn and Bradley Knoll +»  <« 37 5 3975 


TIME LO COME? 1. 2.474 84 £6 $8; 1 ELITE 
(tt SOL 8: £E e- — ieee gun 
* 4 K 


— 7 
q —— 


Mendip Hi 
"SHOE. 1 8 . | 5 | VR 5 * etl 


ah Beaton and Mendip CT d TL il 5! . 8 


Mintern and Ash Beacon = — — * XV 59 


oy * 2 W Cy es * . 
N 2 n e 1 7 F N | 5 
21 * io) Sag * * 2 id * R RR 4 : . 
N * A & N > — * , 1 | 
7 F 1 TVs N * „ 1 A * 40; ＋ 
= 85 228 * 1 7 ; 2 £ 
ts Þ Cs 4 - A - 
= ny - 1 a wt * 
* 
it 
F + * 
* * 
w 
o — 
* 
a 
* 
- 
1 
# = 
* y „ 
n 
7 
. 
% 
- 
** 
” 
* 


* £ ” © + 4.55 K * 


Down and Mendip Hills . - 77 21 oy 
5 - 2 x o 
„„ N 4⸗ 16 23 


Between N | . , 


21,5 
3 t 5 3 * 8 7 % 8 g 2 25 
RN 23-75 J 7” 


7 3 IT. \ | ” — 2 
3494 ** 1 ; On Bradley Knoll. 

* 25 ; 1 13D 7 
. 


- 


ls and Westbury ] Down | „„ e 10¹ 23 36, 


e | 24 0 
Westbury Down and Beacon Hill! - „55 29,25 ;] 29.75 
| 1 | DIET St OM | Ko oe e. Riel 
St. Ann's Hill and Westbury Down REES in 
. . | 5 | 45 45 45 


Westbury Down and Milk Hil | 5 s „ * p44 Juz 


Beacon Hill and Wingreen ms OT - 57 50 38,25 


Beacon Hill and Bull Barrow - 1 ES, 98 34 31 


Wingreen and Bull Barrow Eu = "a att we 49 43 51,25 


- 


Os : By a 2480 rig BROOK 
Bull Barrow and Ach Beacon SRO. „ en, 4543 (325 J 3,8 


2 . / I " "IX N if x 2 55 + L S 14 : 
*r — 4 > * —— 7 

* ; 3. 5 

— 5 p 

4 * * 

we” . 3 


- P 


9995 
63 0 21; 3 * 


** C 3, 


Mendip Hits aud Farley Down . 43 


* 


CES e 4175 4 
; = fo K 


4 ö 7227 1 $ SV. * : 18 ö ; TS | bags : 43 A | 2 
Bradley Knoll and Wingreen . - - 42 55 32,75 


0.7 =: 29.31 thts eee 


* 


—— 


— es 


q 
| 
4 


Between \ ; 4. . FN 
{ ; : * * 1 
* * BY _ 8 * p + v 5 

1 , g * 


* 7 K „ * 

Pilsden and A 
Pilsden and Ash Beacon 

8 1 ＋ ks ; 85 * > *. + * 
Ach Beacon and Bull Barrow 

4 RY £7 AK of! y 1 po . . 3 

„ 2 

r 8 

N 


* 


Bradley Knoll and Mendip Hills 


* 4 % Te * hy 8 * = 72 a * 
Down and St. Ann's Hill x 
wn and St. Ann's 5 
' 8 5 A 2 = + 6 *% Fa 
© 1 2 
a 4 „* a % 
"£4 8 K 4 
t. Ann's Hill and Beacon Hin © 5 Is 
wt. oe» F „ "Iz * — 1 80 — - : : * 
Beacon Hill and Milk Hill "7 S - 
7 LS £5 F 9 — 


—— 
* 


Bradley Knoll and Westbury Don 
Inkpin Down and Milk Hil = | = 
Down and St. Ann's Hill = : 


* C * . 
4 * 55 * 4 1 Or | | A Za 
Q q 8 
1 q 
, _ 


8 — 


„ b „ N by . 8 & 
US 1 1 


Hills and Farley Down - 4 


e eee Beacon Hill ( Amesbury.) 


52 26 42,25 


” AS 


: tle ts 43525 


Mean. 
* | 


Ps f 23 : 15 997%! t 
$% F, A I4. bt 
no A gfe a r 
70 51 57.5 
„ 7 
11 r * 24219, 
I 9 
* 
133 27 377˙ã5. 37 
+ SN 53 31,25 
33.5 733,25 
Dee en 


. 8 . 


abs. 111. 


_ FAA ST eo TAN PS 
S 


5 


2 Zr 


at the old station, and t 


Ihe chief draftsmen and surveyors belonging to the L 

also those afterwards carried on in Essex. It was, f 

their immediate service, that we renewed the survey in this 

quarter, as the Master-Ge | 
from our places afforded. data 


— — I III NT 


* on the subsequent operations in this quarter. 1 | al 


necessary, because fewer obstacles were then expec 


N K y 
TY” _ TY OF A q 5 , VET 
rn 9 e N * N 
9 . 1 
- k 


hoe ge ans foray gone in 


In our Paper published in the Philosophical Transaction 
1795; an observation is made, of the mount then existing for 
the measurement of a base on Salis 
taken to inclose Sedgemoc 
pose was passed a few years een 
tion in 1797. At this time, however, 
set out into parochial allotments, as exhibited in Plate XXV. 
ying this Account. The ditches, represented eee 
this plan, were generally ten feet broad, and five feet 
drains were much wider, the firat being 


on the Moor, or the individual allotments of it, were not traced 


ton quarter, at this time, the task 


therefore, of this base, in an early part of the season, 


— 
4 I bd 8 * - * KN my 
get 2, bit y ED £ ö 
% #6 + 
. ; : , * v. $3» a. 
1 8 * 1 5 4 Us 4 1 2 7 1 4 g as * 8 5 
1 5 * * 4 — * +S 


As it appeared that many instances would | 
which a chain of zo feet in length would be useful, if not abso- 
lutely necessary, one was provided by Mr. RauspEx, in the 
winter; its make and form being precisely similar to those * 
the larger chains, used in the t of our former bases. 

Such a chain did, indeed, prove highly Serviceable in the subse- 


quent operation; as the handles of the 100+feet chain would 


very often have had their places in ditches, or 
on their banks, as to leave im t means of correc tly 
_/ The apparatus for the m 


4 0 


T6505 


* 


EOS 


£ * 


Bin 1 Hes 30 


% 


ro £4 25088 
3 


—— 


3 
* FN of 


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+ 
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Legen I bowhaos. AE SEI mine 
s Sedgemoor being sufficientiy 
mee W een 
texture of the soil, the n could not be 


. 
By ae A 


Wn i 2 
4 "2. 
** 2 As. 


it with the triangles carried on in the 11 


and Far near the village of Moor Lynch; both nearer to the 


Fs 


stativns in the neighbourhood of the base. as mil 


# 


K „ wy 5 ; 
S 7 * * 12 $44 r | 4 


Tr oh hap 5 whale Ter foun d them them ; 


ge stations, Wher they: were an from Dunden Beacon 5 q 
bre and the same erected at the ends. 0 of the base, 5 „ 


Py 


an 


tharvery rifling errors resulted from this 
The station at Ash Beacon was \ 
just Spoken of, and aft 


* 
3 


Mendif ip Fils, for = 


N 18 33 11 . 2 DN 9 | 5 


ing the angle between Moor Lynch and 


bf 


3 2 


he operations of 1798 then terminated. with a dili- 
h after some spot in Cornwall, for a base of only two 
| þ ia Search, however, was 


* 


+ 4 DP . 


in fact we bad reason to imagine it would prove to be; but we „ 
were not willing to relinquish the hope, that a piece of ground 


might be discovered proper for so confined a purpose. The 
ntrarx, F to London 75 „5 
e de . . e e bir 25 | | N 


Ec: 
$4 
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Frierning Tower and Station on Rayleigh Tower 
Frierning and Danbury ps Ws 4 


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Ash Beacon n Hill e 2m ad? to owns bis ty agony. > 


or tþ. 5 Sig Nd bn 1 


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11 ö 
e 05 a 82 i . wot ist tes An itt 


; MO SE 3s avgt rn 87585 


; | T 8 1 TW 


| | Quantork Hite and Bret Kal i : 3 71 * LE, 1 80 85 
7 „ de. Nr e W gel V.. 1 58.25 
| Brent Knoll * fk D 1 * " 70 1 Ai 1 6 H 62 N Ag nütf 1 
Bleak: Down and ip Hills Ss -* uh 123 * 8d, brig WWD 4 43˙6 f 


2 830 


„ 5 = 5 YT „ 19900 T Des 111 bos 19976 T gig 


AOLETS = 
5 225 . | 


4 C00 Halganwn, 46,75 
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Net d , e 1 a ah bas f 
* 


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ane i 1801 


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a ne 1015 Motel eil YU 5373355 — 
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WI IO 12 58507 
Mintern Hill . 
hs teig ny 


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al Move I n "p l er e bee 669 86 794 I 
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09 e ei een T8 Nez n Nan E 9VIeft93%s..02 nuch n 
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Gn 55 the means e ormer i does! 1 i — 
in n applying to the President and Council, * he loan of their 
| \ theodolite, the excellence of which had been ineontestibiy a 
trated by the late Major General Roy. The distinguished 
rhich-the Royal Society have rendered this 
Service, | leave it almost unnecessary for me t 


FITz 
13 


— 


CL 


* "2 N . £44 D190 


Ne eee | 9 2 


of having new 
much inferior, in construction, to thove e to 
ment belonging to' Government... 


YH 
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8 


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on the tria 


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ey „ 855 f At Longdon'"Pt” i AW bas nie een 
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2 


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ee eee ee on g "Ra mor ics Hig! odo 


tis mn ik of 1 A be al ET I . 
9 5 od HWOrtA Iv bak. 9110. ldi 31181191 77 2225 
blait . ui Stiod bogs 0 1 At Croucb Hill. wy 110d #1 11 Pow: 
| 5 - Cer es i * 1 96 K 5 3 

Epw 69 0 4127 Q? 3817 « mT! Bibs U 5505 "Gs 5 tha 277 01 

eilt 30 1180 $291 Haid ell 110 501 2222 2 21 Ae alt. * ee * 


ollen 20 bai 5 25 n if bol FI "at, n Gi a 


f e Lin 
rer Toner ani! We N 100 — — 11% baton. gu GET 0 | 
hoo ol} n of 550 Vero 77 Ju ds bas 105 1501703 Ry 
_— 1 85 ito Bi al 110 blend 8 d zi bote, 9.1 NI. 
Pipers DTS ell. wech de. 1. 105 11011 49132; 29-5) Foc is 


Mr hs: * T7] 2:9] SP 5 * e 07 99 aq $81 pg Bo 0 | 's 4. 


amor, 0¹ ell 75 ee e bach {lt [ht tos ff 6516 x {At 


"Ir 


x 
N 5 18. ; 1 = I = 1 15 
2 A 25 * e ; 
* 5 ** 1 
8 
SN 
4 - 
* 1 
# 
* 
2 
* - 
A 
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yg” 
* 
* 
4 
* 


* 


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4 
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5. 
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1 
0 


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— 
— 
- 
} 
* 
— 
* 
. 
hy 
* 
4 Hs ix 
FA 
A 
* 
1 
. 

8 9 

i * 
\ 7200 
: "$3 * 
i +" 
1 "att 

428 
* 
\ - TW 


2 * N 
g 6 4 - " ds 
„ R 
q Se the tat a > (> Gl 6 
0 * * * * 4 * 
* * F 


vs 
> * 


5 1 @ A ; 
On Buaby Heath. 
* 
' 
ewe 1 — a 5 * , 


Ss 


0 : AO A > 14 f\ 48 ; 
Pen Tower and St. K nn's s Hill | — 9 8 - LE 
. 78 2 1 Xe. : ey | 22 a 1 z Une: 2 81 4 Ma. 


3 2 


„ e 210 fri 


* 55 2 TY - 
$4.5 S 4 x 5 „ n * 8 2 * - ö 


uur. 7. Situations of the Stations. 5 + 


Nees Head. The station on this poi of rid whit * 
ut gur N from Padstow, in Cornwall, is tuated : 
mern . | "tek ty: 
The ground conn a Kita light chan ney other par ſth Head. 
Cadon Barrggo. The station is an the c: mtre of TOW = 
ch : e :Þ very remarkable one, and well known about che 
country. It is about twoymiles, ſrem ! Tintagel, being i in a field 
5 squth, o of. the road Jeading from that town to C ford. . 
Willy. The staff is erected on the highest part of this 
mountain, which is about wine mite Sduthward of Camelford. 5 
The station is about i 158 fee et fo kn i 


Wn 


* 3 


* 


the corner of it, "ond hoe ceny ſeet bow the = he 
d. The station is in a field on the top of the down, being 
about dee de north of Shepion Mag ö S ert o 
it is also north of the road whitti!goes from Wells to Frome. . 


—_—_ 


5 


* 


* | & * * 
r g 1 * "IF 
> 
Fay 8 
< * 
al 2 
4 


Fi * 
mY N 4 
1 % * 1 a \ 
* . 5 A 
7 4» 
4 4 A 
1 
2. 8 ; 
9 
7 
” 
* * 2 
N ; 75 
+ ” A 
. 
Li 
i 
as. - 
* 
* - 
9 P 3 
7 * 
: 
. ? 
4 * 
44 
5 
7 Af 
8 
. 4 7 
* 4 * 
a * 42 
. 
* i 
5 
+ 
* "> 
4 l 
» + 4 
wy” 
o 
x 
d 2 
» 4 7 
* 
* * 
+; » Y 
f £ 


; 5 0 9 7 5 

. 4 1 ö * 

1 1 1 8 "Ia" 5 Rn 5 4 : k : y 
1 5 . 2 | 

„o OY IH p \ ; - = 

a 4 F hi * : 5 N. 
1 . ” \ «<%. 

3 4 * Se" q * 5 2 

1 4 I * * 

- Ct , * 1 : = 
8 5 Fog Ys 4 y : $ 
2 7 

1 $ 

* . $ 


LEI) & r 


er e 


* 


8 


* 
EY . * TH 
* \ 


* 


I No 


+ "> 


1 


Henrea Tue stauen is n 


10 


1 oh W 


: 11 4 15 Hie wy Yldedotq 


i I 
* 4 £ 7 8 * 
+. # 


* 
: F 
ef 
Fi 
4 N . ; 
7." : 4 
"IP 
* ” 
ot, 3 wa” 
5 4 
= 


gail _ berate. 


ell, —— in Oxfordshirél -The statten S. ongthe ape: 
ef tke hill, and may easily be ound, by ineazuring 1.7: feet AHE⁰ „ — 
the fle and feet from the hedge which runs aero the hill. 10 0 LR 
N. Sh The station is west of the bedge. Hill 9813 to 101100 32917 


_ 
5 | 
ov 
W 
6 
E. 
- as 
4K 
2 
. 
i 
* 
* 
* * ; 
N - 
* & 
— 
z 
* 
— — 
* 7 
, ES 
: * 
— > 2 
P 
- 
. 
* 
—— 4 
* , 2 


* 


N 
N "x 


at Io —— blen  beto99? 


o 


| 
i} 
; 
F 
5 
i 
q 


; Xs * I * a * 7 K n 
N 4 N A ay - * * of uy 5 N * 
= * ol 4 7 P 7 3 8 FF * 1 4 2 9 
N [OR Far. . 9 as 5 TY * 5 N IR W * als) TH * = TY * * 3 - - why * — * 
* x 5 7 * _s y «A or * N 2 n * * * bh _ 
W. 41 "$4 Sv 58 Ye 0 MS. * - — N 5 5 rod 
n 1 Fra # ; ) 4 KF 
4 Pe ; W. 
1 5 N 8 FEE p —— 7 | . 
Lane . ; 5 8 - . * * * 
7 - 1 - . 
7 r * 8 
5 
I * 
* 
0 
- 
= - % * 
g » 
* * 
» ® _ 
& — { x 
* * " 0 * 
1 
» 
* 
bo 1 
* * 1 
* 
"A 


i Hens r 


Ble of. The station is on the bare 


"7 it it is 


dad 1oles. 


0 
„ 1 
BY 


) feet: from either of the 


* : 4 * . 0 
=” HE I TR, . * ; by 4 mw * Ry : 2 
* 357” MITES Fc ITS 2 „ 1 * N yl: WO Ts 3 „ 
$ 0 ** Iu LY „ % * 4 * W, + * n © * X. 1 2 x 2 # 24 — "I F © 1 +. 4 "A 
$ y * is 


son rkable un. ere very 


gene r C 


9 1 „ N 13 


The only 
i ean . 


35334 


#4 ». i 


is close to the gate of the inclosure, and on 
covered With eh 


is, commands an extensive view, and is not far from the town of 
Evercrutch. Bruton is also near it. The Station | is in the middle 

* 5 21 2 9277 
ie Hill. * . 


e's > #23 3 
WY bod 1 1 
4 


; Oxfordshire, 


A 
- 


$44.4 


uur Hill, hear Banbury, in 


appears as if it were truncated,” 
e 213 to al: robe fs 


meren 


; ae 2 
S230 IS 25. $% 7 


LA 


_ _—_ 81 * 1 in the north- east corner, 20 


. 
. 


> 
2 
8 46 


= | of os 4 
co riners to place 8 
| t. ng will (3 YE iy 2 


2 


Canewden Steeple, | 
| Frierning St. Cl 


oh 
* 


be, LIK” I g | . 4 4 T N 
3 0 I" , 
'. — * ” 8 
p N © \ 
Fj 4 8 * r * 
3 4 a 1-7 ely. g 75 BY © 6. IS 
"oo. 4d MAAS 4 4 $3 Coen i 8 
77 . * 1 9 . „ „ 


3 


. 


— 


* e 


boxer C Court St. . S. Oed Prior) * Fugue, wah: 
ass. Shoblry New, Staff, 
2 


. * 


| "F re Few : nile 8 ; 
|S JF oF 
Little Ben ey'S 


e 
Glems ford 80 0 


o 


Tt 


+ SR 7 
74 TER 


, f 
4 7 * * 2 
wa © Þ 4 * E 4 = Wu, 


e 
tor St. 1 


e 1 


4 
pie 
EN 


Steeple. Station 


2 


— 0 


"43. 
4 


15 


21 


0 


eq 


F » 
of Oy PS 
£ 7 8 1 1 

8E «VF 8 A 8-19 
9 » 


2” 


. os I 2 * 
. : 


-+ 


* 
* 
bY 
© 
- 
» 
+I 


ST a+ 


4 


EIS 1 
11 


7 EO 
< 4 
a x 


ma" 


N 
1 8 

AN 
8 


1 


St 


" Purfleet Clif, ny” 


rou 2 5 


* 7 


9 Kt 


„ 
7 » 


4 - 
© OT INE 71 FE, we > 
AE SST ES 

— As 1 i — 


Y * „ * 
? -y 4 7 * * 7 4 
1 — „ #2 * 9 


* 


Pw as . - 


— ̃ — 
* enn 2 *, 
ws. TO ES 
* > 2 
2 EY L 


1 
N 
” 
i 
1 
1 
19 
: 
1 
* i 
1 
1 
4 


2 * 


: ** 
? 1 F 
4 * 89 „ x Yo 
. 1 


e e 4s ee bold LR T 4 e at" e wool 


PE I #9684 
A 


Wr. VIII, Par c. relating ts 3 the Bax - on King 5 a oof, 


. 1 


5 and t e. ie edluc een 4 that. 


9 
| 


aq" un tai 7 up int + Teer, vo apprehensiohs Were 
entertained that either of them Gas e elongated by the rustin g of 

the joints. It was, however, our wish to have compared them 
with each other, previous to the commencement of this operation, 
and attempts were made, but ren ctory,, from the 


want of sufficient firmness in the b Dil. wo was 00 till we arrived 


at the FO Ons,” that a 


the measuring chain A, was th 11 0 | tr d 
B, and found to be thirteen divisions of the micrometer head, 


attached to the brass scale, i in excess. In these trials, the tem- 
perature” remained constant; tlie mercury in FahREN 
rmometer bei ng at 667 403. 02/6 A 1161/09 

2 . chain, * oem of in a. former 


a — at ec 55 5 80 
elneflt, the chizins * 
r when as Setting alin A, was found to exceed the 


standard, 174 divisions on the micrometer head: this was after 


278, chains were measured. Now, when 70 chains only had 
ence between A and B was 1g of those 


A 


20 


Ai ati 174 ie divisions, was the wear of 
B, in measuring ad chains. Therefore, the Whole wear is 
| found by this proportion, vis, 20g.: A:: 273 : 5,223 divisions, 
- of an inch; which very inconsiderable quantity, like the 
wear on on Salisbury Plain, no doubt, arose from the pivots and 
pivc t holes of the joints being polished by continual use. 
This supposition seems just; as the wear of the chain, after 4 
the eee ment on 1 Hounslow: Heath, was bound t i be much 1 55 
en Ig 13 
15 The length of the chain A. 8 ab lch bande B, 
was accurately ascertained by Mr. RAMSDEN, | in the year 179g, 


4442 TE 801 an ary 5  hervfore; adding the wear wich took 
——4 on Salisbury Plain, viz. 7x5 part of an inch, we get the | 

length of A at the commenanment of the measurement on | 
E )Or = 100,0100g. feet. e eee e . 

From repeated trials, as bebe Sd the aid B was 

found to exceed the length of twice that of the new -fifty-feet 
chain, 14 divisions of the: micrometer head; and, after the mea- 
surement, the same chain fell short of A, 174 of those divisions: 5 
hence, A exceeds twice the ength of the g- feet chain, 314 divi- 
sions. Therefore the length of the Short chain, in the e n 
of 54 my” be taken at $9,00075 Me. 


- 


„ 2 & alt ' © 


n {44 1. en | F 
7 4 Fre SME Fe 17.69 

VCC 2 
* . 


, * 
45 1 2 * 1 * Man e 17 A”. 


5 
Ax. . Tai the Measurement te Bas ay Verificatio 5 
Eisen den 8 1 . Eng 8 en or. De cha 2.76 Þ 10 vt 


* * * * 2 
n , K. een * 
9 F F Vs 1 9 
1 9 Wh: 5 * 
* n e ES, NEL * PLS 7 — 
A* * > - 
8 . J * x - 
#5 * * 
* A 
8 8 1 
a : 
3 $ A * 
I, © * 
2 * 1 
7 2 
* 1 — a5 
0 wi +4 Re 
N > * 
- 
4 
5 4 * 
9. = 
ow . 
— 1 * 
— » 
* 
. 
: ” 
* 
- 
* 
1 5 
- 
. 
- 
<a 


und 


ay „ 


apparent length of of t t he 


he 


1 N, Af 
' wherefore, t the 


6 niahas P 


ing de wer d dy: 2 
Plain bid 


11 * . * 
No 2 7 


IO 


. a & 
55 
x 


17 L * 99 


of the chain's ler 


the Bas. 


12 e 2 


5 


as 


-L 
N 


ä 
5 1 * -& 
* * * 
5 
py 3.28 
* 
* 
* 
. 


204 


* 


| = 2.7075 
foot; which add 1 — Rt 


5 I 
$4 44 


47 


= : 7 128 * : - 6" # 
* 4 55 1 s 4 2 
y #4 2 4 of 


B 1&3 3 4 * —4 
mometer was 985 13 * fore, 


0 
* * * Frag & ys. Les : . 
23 * 4 * "2; = 10 3 * 1 FE y 2 85 33 Þ3-- * „ 


feet; which ao add 
HQ: alt 8 


* 


3 1 
4 


Senor po „„ 


« Fo a 25 | Fo. + + Fae 


above Zo! feet, in in the e tempera 


5 SO EI, 23 2 — eh I LE ES 


Nets 


of pn 


: CHEE 


* * 


1 


: 


"== sum "of all the he 


8 


89 W225. x8 o 


* 


8 


The sum of all the degrees shewn by the ther- 


x 272,8 


Aan. n from t! he comparison of | the > 50-foet chain 
with dhe standard k B, it appeared that the excess 
eof 54 * Was 0,09075 _ 


* W * * 
A EF 


* 


— 


+% 4 £3 -B 


mometers placed by. the Sides of the LOTS chain, 


» 


$a 


© was 1972; therefore = .— 2 re 21 =0,0365 


w 


. 2 SY 
3 k * i 


* r 


— 
* 


r Rab 


cr „ 


* 
is hr? 
- 
* 
* * 
* 4 * — 
+ 


& 7 „ . NY 
4 \#>4.8 "7 


4 

a . 7 nt 

$7.1 TS 

8 £3 46% 
* 


fn * 
A MEET 
\ 75 Fs 2p 
2 4 


* 
4 * = 4 


* 
4 - 8 
— * * 
* 
* 
o 
" 
* * 
* 
4 ; 
* 
» 
n 1 
4 
3 
2 
* 
: 1 
- 2 
4 : CE” 
A 44 1 - 
4 * . . 
* 
1 
* | 
* 
8 
< 
* yg 


+ 0,0965 by 


27682, 944 


— 


] 
| 


r 


r 
_ - — — 


e DAT Tor er 0 0 ⁵ —ͤ“Pä0W 7... —˙r—08 9 A CC > 
2 — 2 4 


MP — — — — ee — 4g > 


———— < ans nu 1 aA 


„ ü 5 a 0 . * a 
; F * i a b 
— ; | L % 
N 
= 


\ vil 5 nope E 27682, 944 
And, for the r Jon of the 


| base to the bebe. 5 
raturevef 62*, viz: ber g on de bras 


le, we have 1. bre | 2 T. 
N 5 o, 1237 X 22228 * ($99) OL; fes 2 45 
—_— =2 2497 vet ; which 
S854. OL - _ 2 5 7 928 8 
4 


bt) 4. eee 

1 A. . 134 5 1 91 eee ? TY 7 
Therefore, the length. of the base is | beet 37680 51417 
which, neglecting eimal. may be taken at 27680 feet. f 


ch 
62 { . 291 


Wo. 
. 

"> 
wo 
% ad 
* 
+ 
* 
* 
8 
"> 

* 
— 
. 
131 
* 

wo 
mat 

8 
yo. 
9 
* 
Ix 


* * 


8 | As to the probable urror of thejabove conclusion, I ʒno not 


how to form a just opinion y hard, and 
otherwise favourable, I think a base of 5 miles might be mea 
sured so accurately, as to afford à result not differing from the 
F __ than three inches: but, on this occasion, I should 


Lo not suppose the error can he less than six, nor more 
inches. Motives for adoptin 8 this. auppontion, have been related 


\ 


ina foregoing article. e 1 | 
3 | 1 8 128, LE „ N ; 4 1 | 
| ART. xI. Calculation of 1 the Sides of certain principal * T Triangles in 
| | Cornwall and Devonshire. Plate . „„ 


? * 5 Z a"; »h 
7 $7 3. ES. 1. 7 ay 1 99 5 ab 3 | a 
2 E . X = > — 7 ; 5 — 1 - AS +, 99 + 7 
« . : + 2 2 13 1 * 85 To. 7 2. 3 1 $A - 5 4 s £ * "3 5 5 = e 3.14% 


Distance Foy Hensbarrow to 85 Agnes Beacon, 970848 8 Feet. Phi, Trans 1797. p. 9 


— 7 : £45 & kb £24 
SS 15 N # . 4 8 


— . 1 ay % 8 WR 


f 


8 


* 


ep leren ile Spberi- N 
Names of atations. | angles, Diff. cal 


2 
9 
© 
= 


rr > —5V > 
* 
4 
ORE 


* 

I 
09 

— 
2 


1 
| Distances. 
N a 5 8 . 7 . BY 
1 1 . * OF {OFT Ef excess... er we », 8 
1 : „ * 5 A „ E 445" Ew $44 F | „„ EA 141 + LLE 4302 F521 3 * 2 wy #4 54.4 2.3 


2 Foe. 
1 


* 8 £ 
4 f. 7 5 * 7 
N | — * 4. $ 4 3 


— 9 FT 


3 . 1 0 I 


* * F 5 _ X , '% 1 * * 4 A pI eines: A N A 7 | $a 4 * 
© " 7 an y 8 1 Bi 4 *. A ran w 2 18 #F 4 34 5 1 : | 63 5 Ty 
* ” * * SY g 7 *. 4 % * — * „ „* by * : 4 . | ky; For : 7 
| * 


LE ND 


NG; * 


» 
8 {3 
* 

4 


* 


9 1 

* v 4 

4 
© . 2 
* — * 
= : 
ws 

. 4 

5 ö 
_ 4 : 
W - 
a - 
N - 


« 


4444447 gooey = 


9; Ay 16% Wer # hae Pe A = 4, «30 r 


471378 F 


5 | bY 15 "ot $ # | . 
9 wh W.. 9 K 
6 5 wy 532 q 
N 90 Ki 1 — : . N > * by : .* 
0 74 7 [2 N hy . 2 
1 oo | IS 21 3 726 
0 =" 3 { 8 | g 2 DS 
; j 5 x 4h - ; 
2 ' © By . St: 2 3. : f q 
5. PCS 
a abc 
7 ; 
* 
* . 
1 ended. z 
N a „ ao ey WEAR ny. 
1 WP 
J SJ 
. "3 
* 
* 
5 
- 
4 
* 1 
"a $ * 7 
> "i "wn. . k » f Y . 4 1 3 1 7 : 8 2 . 1 < ** 
17 . Fe 35 * * LJ UT ah; .x 1% TS FO DS 1 Ts 4 | 53 45 4 OY the. 4} * 2 & 5 2 7 g ; 
| ; "4 8 2 22 4.4 7, 1 1 A a N . £ ov b 
< * 1 4 1 * * F 1 * 15 * * 5 * 5 9 #5 1 8 F 14 — 7 * AA Wy - 1 | . 4 
3 N 4 ; * : 5 1 
* Gi 4 
* 7 ba o 
* F 3 
* 
1 4 
* F * 
* 4 2 
=y 
* 7 ö 
— 7 
- * £2 
— N 
* 
4 
* 
2 . 
- 
5 mn 
1 
o 
4 
f | K 5 6 a N 7 2 4 J 4 __ + ” 
| | "« * - 
| 2100 3 | 
% 9 wo ww ' 
S £44 * 1 $ T's 
> * — * 75 HY ſ 1 * r 1 . 2 1 * — 
i T1: SOS 8 Il nde 
2 A 
3 © 
$ on 
4 £ ? f 
X KO s 7 ks * . : 7 * 
* 
2 oo o 
4 OI 
o * * : 
* 
- 6 | 
— . \ 
a — 
by q 
. * — 
5 * — 
— \ 
; * * 5 
8 ” : 
* . » av 9 - 


r 
1 
/ Pe 
„ 
5 
4H 
_. 
+." oe 
+4: $ 
4 - 
1 
+. 
— 
os f 
"FF 
* 


= n Pr. 
SCC 
+ 


8 
! 


* 2 3 
* — 
CNET 

Pg 


Nrdgts 
S008 N 


Weh 
4 Wn 


= £0205 I 2 Dn r 


2 — corrected 


3 


io 


0 


39 44 580 13 a 
1 ne 


4 
wot Mm e : 
bro ce, 


NAW Gun 
3 * 


0 Mee 'L 


—ʒ( 


— 


* — pe 
> — 
— — — — 4 - 
r — 
a * * 5 » 
2 . — * , 


"x 
«Fo 
[1 


1 Mean distance from . 


K 1 2 N — OY 1 $2 


— Arts 5+: ee j 


=O enn 
beth . 1 


* i . 


* 
— —-— 


| Wort 77 . 4 5 


P i 4 a J l nim 
A ARE. ahh 


1 


: TI 211 | n 5 F 
Pp bee 1252 } 


on rid be 
ephen's ous 4 to o Carraton Hill, 52292,7 feet. '2 


542561 55 
ö 52 ; 39. 


bs it. This of 


fo gre distance 


fe | | | I | 
MS A all Wy: 8 * F 


former; To 0 have visited Kit I 


alter the observa 


_ were made at the 1 
time would have been 9 | 


VI... 


+ 5/08 TS 


Ty 


- 16644 OR | ALE 
He #* > — N ? 


— 


yo 2 "nt +. 7e¹ 


* 


4 hd P 
= 2þ 


1 


* 
Y 


81! 


* a” 
1 F wee 


"4 


In the Philosophical e for I 797. 


Hs 


| p-. 455, the nee ſigns Bull Barrow to 
— Wing is said to be 69058. being 42 feet greater than the above n. 


ons: 


„en e 72074 ; : 


* 2 * 


1 175 Aw 


panes 


C Bradley Knoll 
Wages 


a +£Þ, F 


42 55 2 


15 


1 $346 


f 


- 
CRY 7 4 
2 — WF. * 2 
— , NE OG Bos 9. 2 r pens - : — n pong” * 
. . — a Mis r 3 
ax 4 - 4 3 1 Ru 5 * 4 x : a 
FI COTS q . 5 ; — 
| - — I eg P ee renee 
— AER ow — ¶ 1 III a CONE — — p * 2 E 
| o - - — — 


ee 


44 43 * 


hw 
: 5 
. 524 
I ; cms © Þ 
2 1 * —— WF 
25 * 2 : 
* f 3 
8 * . 
5 * 


eee 


's 


31 | 
FI 
3 
-= 
* 
* 
LL 


£ > 4 % k — A 
4 Key, - - 5 8 
| | So — 
5 * 
2 : . 
* > 
* * 
4 
7 8 
Wo, £ x *. 
n 4 
> 3 
N e's 


» av es 
GS * — 
x 
. 

* £ 

2 

ar nach 
£75 * 
IF 

£ 

» 


* 
1 
7 
43s 


% 
. ” 
a 
* . 
4 : 
— 
* * 
= 
* 1 — 
* 
9 
2 i 
4 3 


r 


259: 


* 4 
N W 
* A C4 U 
5 
* l vic 5 
< « 4 2 
* 1 EE — 
* * . | 
8 2 FI . — 
* 7 - + 
2 4 5 LP "TH 
4 : 2 
D x | 5 
Aly [2 _ g 
* * * 
3 
Az 
f "EA. * * i ; * 
* e N — 
9 
5 hg, 
— 1 91 
— , 4» 


r 4 ** * 


n 1er * 


* 
: — 
* 5 
. * ” 
& g 
— : . 
bk 
* 
* * 
-—_ fv: * * 
2 * * 
— -- 4 5 
- * WE wo * * 
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xis 


* 19. 8. * 


1 


a Bagshot Heath, - - 
Highelere 


1 \ % ; - . 
LY * 5 


1 
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23 1 
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55 3 32 26 
45 10 18,25 


78 17 18,25 


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1 Wage 
1 


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| 53 33 4955 


— s 178 590 59-5. 


" White Horse Hill from. 


r Veadon Hill to Hi ghclere 986944 


1 


—3.24 


Nuffield 
Hi Shelere 


120577. 7 
| j108503,1 


a "E: 


In REVERE 0 


13 


tance 


feet. Phil Trans. 1795. 5. 27 


White Horse tm from 1 99 Highclere 


= 
. 


a. 


. 
a4 = 2 * iS 


Beacon Hill - - 1 42 8% je Wb, RAT! 7 tax 
Highelere - | 56 © 29,75|+0,08| = 6 56 © 29,25 
Inkpin Hill - = [106 16 _$3-25 — 106 16 52,5 | 
; þ 83 5 . | 
tho. 0 * ood 0,50 + 1,0. 25 f 
ö - 7 | H | — r bs * 1 111 | 
— my _ _— as — N — NS CON CVE 0 [ECTS 

xxxII. e . 34 27 50, 75 +0,38] ä 34 27 50,75 

[Lokpin Hill - 133 27 57-5 „ 
[White Horse Hin 12 4 21,5 5 12 4 11,25 

. bo X ; 7 2 4 I | ; 

Bo omen infos Fr 3 


— | 8464731 


8,1 Shall use 180387.) let for the dis- 
tween White Horse Hill and Nuffield: this is derived from 


the base on Hounslow Heath. By the last triangle, White Horse Hill, 


from Highclere, i is distant 1085655; feet; which. is computed. from 
Plain. The distance be! 


« — — — — _ 


ween those stations, 


found by the second of the above triangles, is 108668 i fact. There- 
fore, whether the distance between White Horse Hill and Nuffield 


be founded on the base measured on Salisbury Plain, or N 


gunslow 


Heath, nearly the same conclusion i 18 derived: the difference will 


—— 


. 


1 


* 


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— bo (ER , 43 8 
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38 10 44 (0,5 | | 38 10 42,75]. 
49:54 234]. [72338475 | | 
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of oy : ? 1 


Boks 55 4 g a 


2 


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orley + 


BT . 


0 : Ei 


Arbury Hill - 


from Epwell to Corley comes out 14383 
' from the same distance found by the last triangle. 


— 
£ 
* 
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1 54 45 18275 
35 17 36,75 


wy 
% 


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1180 O o 


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nne 


Na — 


Corley from { 


By the triangle Broadway Beacon, Epwell, Corley, nc 
Corley to Broadway Beacon is the only distance computed ; and this has been obtained 
through the means of two observed angles only. When the observations were made at 

Broadway Beacon, it was not imagined Corley could be seen ; and the contrary was not known | 
till the party arrived at the latter place. In so large a triangle, it would certainly be right to 

observe all the angles: but I have given ws Tones, os, they now stand, because the distance 
1 feet, which 


is a j 


—2,29| 


2529 


Epwell 


N 
1 


( 


o 


89 57 
54 45 18,25 : 
35 17 36,5 


1 
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Arbury Hill! 


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Arbu 3 
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— — — — 
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- _ — —— * 
— — - — * — 
2 a. 


[Bow Brickhill - 


$ 4% e 


[ 


68 22 56,75 |= 
43 16 55, 


5 0,99 
68.20 775 —1, 22 
rr 2 W 3 2 1 - * 4:4, o 


* 


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1117463 


1 


hs! the above) the iihtence rom 
determination differs only three feet 


| 68 22 59 


1 


143827,8 


* 


. — 
3 ; 


4 
1 
7 
; 


triangle, — Seutchamfly 87 in Berkshire, and the station 


er, were chosen. 


7 
9 , . P 5 
f ? 


The base on which these 


31 


. —— — a 9 "UP 


a 


| Names of 22 


8 


ty 
- 
8 
2 


Angles c 


for calculation... 


[Noffcla - | 


White Horse Hil 
1 8 Hill! 


* 


—— > war 


[35-34 325 2.4 
81 53 29975 (=0,74 


Ke 


* 


. ba 
_ — ot A N 


\\ =. 


* 


ae” 


1 „ 85 


1 62 32 . 


35 34 24 
81 53 30 


855 58,25 


* 


nf 


* 


\ 
by f 
+» 3 


86 | 
*:.46 a, * K 


White Horse Hill 
Shotover Hill 


4 


11 * N 


4+ ae pn Fe . 3 e 


„ 


1 1 5 
4 — * 18 
; 3 
1 
4 
* 
| 


* * 
£7 * 
13 13 
4: / ITN 1 
2 3 * 4 7 - 
" a & W 9 * + 72 
** F * 
* 
- 
= 
— 


W r ee. 


147113, 
93828, 


108058,9 
quan- 


ory 


4 — — — — 


1 


1 


Ba Gn ee 


near 


LY hs ALY 


feet 


eee 


e 
e 
8 
n 
Py err 


ay 


88. 


IE WA 


Brickhill to Brill is 


— 


erence of 


"NNN aA cs 


— WED 


v 
* 


ood 


Wen 
Shotover Hill 


# *4 
* 
W 7 

ee e 


i 


TOY 
M * * a, 


4 ee. 


dere 


e e 


hence, 108056, 9 feet m 


th 


8 


3 


Brill frbm 


es — Ages SLY 


$5 


the distance from 


5 


4 

1 

3 
1 


- 


$7 


M 


Hort Loo avans 44 ph oe 


5 


* 


3 


x 


derable 


inconsi 


—— eve} 


_ 


1 
1 


. 


"83 2 


> * » , 
5 . _ a 
5 
1 1 * 
"AF 


* 


1 


42 23 30,75 


* 
FA 


3 
4 


.0 


K 


N | 
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— 


= 


1 


i 


A 


- — —_— 


1 


8 5 
3 


en ON 1h 


þ a, r — 


rm 4. 


88 


1 


2 


kh 


* » Aa PT 2 oo rene, a 7 


ric 


to the first deterimidation, 


B 
ing 
y the last, 10 


T 


rd 


* 


ch must be deem 


1 


WP 


— 


e * e 


=. 
* 
— 


% 


* 
- 


and b 


W 


** 1 


Lg 


* ; 
4% 


tity wh 
distance 


P * 


feet 


bt : 
e195 14%. > tr Gr _— 


——— — ˙·» 


2 0 


2 wt A N * 2 9 0 * — 2 = * 
mot . —— — —— — ————————— 


£ "ey 


x * * 
5 » 
. 
* «4 2 
— pt 1 
5 ? * F N 
7 * 
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* 
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s 3 
. 
CY * i. * 3" 
. my © % "4 
4 L 
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J 8 


8 : 
A la 5 Feet. 
XL VIII 4 "EY p 
J %% - 
5 | 
[+0-42 ES] 
„ ndover - $146,9 
4 1794 j 3 a Brickhill = 1491-3 | : 
I 0 
In the above triangle, I have computed the distances of Wendover and Bow Brickbill from Fa 
"Quainton with . 0 hy feet, the side Wen 
5 * 
* : 
” a Ys 52 17 5 | 
42 1 
3 n : 
ton from 
| Therefore, 9＋ be cope nearly the true dit 
7 | 
| e BER 0B | | 
I ; 5 5 T " i ö j 
- 2 | . 2 My” 5 FILE SITY — a 8 ieee 1 OOF DCE IE | 4 1 8 
f j | ] 1 bi 1 
| Ki 85 | | 


L. [Bow Brickhill ' - | 42 10 36,75 | „ 10 36,5 
82 50 20, 5 383 $020 - | 


: 
[14 54438 $3 Þ 0 | $4 35 $355 Ft 
TSS 2 S ; "+ 8 0 % a — "= * n * 5 p — - 4 * 7 - 
647129} $1153 fern att ogy ti ee San N 


CET 


= 
2 
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5 
„ 


8 
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4 
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CLOS 


S 
8 
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1118 n 1 T PX; 
* Wan Io ie Of 4 . 1 ae FAR: 
FALLS Ei Wn BETH r {3 $5 


— 


A © $ , a+ 2 #:4 A wary 
5 4 46 222 I. . SEK CREE 


2 TY . 5 
£42 £5. 7 10 4 18 2 + &#% i 3 10 x. 


4.4 
— 
. 
* 
* 


4 v 
i y * * 
8 1 L 


* 

> 

LEST T 429+ 4 + 4 

14 120 2d „„ „ i 
os 


. „ ——— . ee e tt 
- . Ny 


4 r 
the triangles formed by their e this 


apt . 1 


12 122 . 


2 
— 


FN 


> 
- 
- 


— 
"I. 


. — 

2535 I Lany 
—— \ 

8 - ny 


—— - 
— — 
wy = 


— >, 


_ — 


—_ | \ 
=. _ — 
. 2 


— 
— 
—— 


N 
' 


— 


—— er Ar err er, 


»*.. — — 

— 2 

— — 
— 


_— 


entree — A Ore 
— as logs 


EI 
_ \ : 
— — — 
——— — — —— 
oy __ 6 


— 


— — — <a — — n 
-, + — — — — — — — — 


— —ä ero—_—_ 
>" EAT N ws 
5 — 


Ia * 
r 
TY nnd 


4 ev 


— 


— 


—— — — 
— ————— . — — 


—— — 


— — — a 
— 2 


— 
Cs 


— - — —— — ?. ,‚§«Ü—rXTʃʃ“¼.wfiñ — . ones nos 
4 g 


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$ '% IS . 
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VB nt 70 wt ve, Mg q a * RE x Br + ' \ i Op £5 
. 9 o 2 


x 1 14h 
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4 p 
* 


75 58 26 


. of * 
Kinsworth - 1 46 22 1 46 2 
8 514 8 
— 
Li dling R R 9 49 15 12 
1 4 1 Pax 442 oi n , my oy - | þ 7 $8: 2] EE TEE OE OE ON 2 ae 11 
$ j — — — — 
4 i : {6 5 7 N F - yo % 
; } » ; 
1 26 , | ; i ; ; 
* 74 oy 4s % 4 1 * * 4 : . © x 44 7 % * 
i * * = k 
- \ x ** 5 Ane 2 
308 x #3 1 , — FI in 
1 i 1 x 5 1 
0 9 9 FIR 1 
. : 4 +» n 4 + 
1 "I mr - — J 47280 
e | yhoe from 5 46 
| — 3 > XL T4 * » OE > — r 


=> 


Stance from Linyhoe bo Linsworth, as found in a Ke triangle, is 


Vue band 47280 feet 3 therefore, 47279.3 may be taken for the true dis 


47278, 
_ 


29935. 
1 feet, 


feet.” 


i Brickhill © 
Lillyhoe _ 
e - 


— 


þ * ” . 1 * 
N 4 2 Ar 3 N 3 N Nr * 
8 5 . 1 4 ab =_ v2 15 8 * 8 6 1 1 "IP 
28 5 
85 1 


4 
BY: FRY. 5 33 


* —— * 
„„ fb ah cove eo { pet „ N e n „„ * W 7 „* ä has; % 4 4a v4 fa FRO 8 
—* £ 
. * o i ' 4 
1 , . , 
5 1 I 4 1 i * 
* 5 * 5 F : * 1 1 * * ” 
t 8 B 3. 1 ; 1 1 ; 3 857 of 
BOY i 9 $2 *. * þ 1 1 5 1 * . & 4» 1 4 8 
7 — - 4 * 1 : 
& 8 . * 9 5 
1 1 * fg [1 1 3 1 + 4 
4 0 1 * f F ub I 
: # k, Fd A # * ** 1 r 2 
54 * 7 _ _ 
: * 4 * * . ? Lo 4: fs © 4 s 
1 * Ss: 5 5 ly 4 12 as - l 
1 , 4 2 » 4 
ö 185 . L 1 : 1 $ 2 Y x l 5 
4 * : : K 
F * Karner ee 


4 | | 
And this triangle, with: u chat 
Lidlington = 
it assigns 


: 3 28 2 
* 1 8 * 1 3 


ic 
* 
. 
Es 

4 


26,1 feet; and, wht1 the 
aszigns 69868 feet for the mean ny 


it, gives 


* 


44 


I b7 


6 80 gle Lilly hoe, Kinzworth, and Bow | 
tance between Lilſyhoe and Bow Brickhill. 


on 
Nera 7 
<# he | 7 
3x 4 


{ „ 
i 
5 
4% 
? c 
+ ©4455 
- 


| 14 54 42975 


5 52 11,5 


' 52 11,5 
3 is 54 42,75 
Wh NOT 10 13 8.75 


FOR 


50673, 


+ -$ \ 
ec ; - Fg 
FA thts 33 Þ$ Fol 5 
2 ad 3 S&&f. HOKIES 


. 0 -p 923 it 
23 26,25 
* 4 % 
© 
SF 


4 > 
r 


— 
an ee any * 5 


a Brill 
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| Distance White Horse Hill to Shotover Hill 108050,2 feet. 


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more and Hanger Hill Tower. da | 
The angle at the station on Bow Brickhill, (ee the p g 


wude 0 between Wendover and. Kinsworth, is 46 18' 8,5; 


nd a 57008 feet mo een Bu ; thees give th . owing tri 
LEE Bow Brickhii 46 18, 8g. 
Wenner 1 WE 25 2 % A 8 pu 
Wie Kinsworth _ 9646 30%, ( 
From which the bes bejwem! Wendover and Kinsworth 
is found = = 670go,7 feet. The observed angle at Wendover, | 
between F Bow. Brickhill. and Stanmore, is 102* 22' 29“; from 
which, subtracting go 25' 21”,25, the xp between Bow Brick- - 
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inswort and Stanmore. Again, the observed angle at Kins- 


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from 'which, subtracting the angle between Bow Brickhill and 


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ad Wendover. If these computed angles are actually 
N as might be observed, were Kinsworth and Wendover 
visible from e ch other, the a ole at Stanmore between those 
t ons ought tobe 7 41 Y 89", nearly: dut the observed angle 
was gp 47 41",755 Ty ale, a tid Sh ao og 


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nine the distance of the station on Pen Church Tower, E 


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we have two e in the following triangle, vix. 
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nates... — 23 44 48 5 L 
den Tower - bs e 


Pen Tower - 1s. 1 Py Which triangle gives pUhieH 200003 


0 the distance I Pen front Wenidover = 49027 .. feet. 
Stanmore = 75825, 4] 


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With this distance of. Stanmore. from- Pen, found from the 
le, and alzo that between Stanmore and Hanger Hm, a 
derived from the triangle, Bagshot Heath: Min, and 
Stanmore, together with the included: angle at Stanmore, viz. 
109 t Ke Ke e the distance of Pen to Hanger Hi Hill 
dower det. The ame -ditance wp found, 
DEM ference is o. nlv.$.- | 
given for the survey of this 1 


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Hill Spire £7 ra . pine 
Wig. . n Dowd g i 


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— pre „ 


intertected Objects. 


of the Stations from 


OP 11 


2 *2 


ee N N IN 


7 Windmill - 


113 _ -, 
| Tharfield Windmill 1 0 W 


* 
* 1 x 1 3 * . - | 


0161 10 


bor Baa ee 25 RO 


. Kinowarth | - - $:32900 £19 


LTottpnbee (Satin 


Bow Brickhill 3 . 
Kinsworth VNN 


a1 An 0 Wai 


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Chalgrave Steeple -— * 2 2] 
Bow Brickhill <- — 
Kia SP a 2 N , 
e ort „ „eie nen; 
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15 45 ff 


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Jragiogn Windmill 


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Wann . ba "149% 4 70 *. N 


* 
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„„ 7 8 . („rr en ed 


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142850" 


$93 Big 1.1 


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* % 4 
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2 fo 
a —— WT Fe "© ” — 
2 
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= 2 — 


cen En ——— 42 


7 " k 
f 0 a 
34 21 


| Ae Green Elm Tree 


K e = == 


in 


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illy — „ 


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ee 


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mene . 


ow dai rom Tote Hill 0138.7 . Eels 
y WY uv N 3 
un 33 ed Bang ee e © 1 * ; ' 1 e eee 


n hee at de cunt toes the 
20 G. 2 — . , 


YA Vip r 1 = . N 5 * NK 
Bow B Khin n ä - 1 l 


ET 2 Em 
Trusler Hill + - 1 e Weed e 


Crawley Steeple _ 35 4 W 
Bow Wikchbit © 3 4 


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5 5 , » * 2 p ; g : 2 : ; . a Wy ; 
Trusler Hill! 7; 25 | 1. 1 fry) BJ, 10 


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Bow Brickhill | 1 
Taler TI!!! 343% 
Woburn Steghle 

ent Ii * 8 


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neee e e 


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Bow Brickhill - _ <= 
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brig coy {I oalf; buen 2 TI ani 
7 Kinsworth ae —— 78,7 : 
4 24 2 i . 45 » — 
: Kinsworth pre ct e 4/4 1 2 Fe Wir gg - 
=_ Lillyhoe, -, - rue, 35264 
rin A1 igt . (] « 1 
| Flitwick Steeple" '\ 71 2 11 7785 {#7 B34 * 11101 217 VIC rye — 
|; An boo mf vorut off nm. 4 Vd Dohlen LE Nil 
] | | k ( | 4 ; 
g | $ | | | | 2 149 tn 
* 1 * 8 * 8 1 1 fil 4 * 4 . 5 2 2 | , 3 2 f | | . rer 
r wored ard mon ' goreteth oi] 
-e of) cool] Here rotate omar oft 0 bris- 4 142400 
* 114 d „ern 1 1 .fid4 994) JJ Der ei QOH? 
CM 1622! : $2008 LID 5 SEE ns 700 FLO) Iris 2 all: ble e * N 
; 4 oF] 3 346) ol 4' tracy tear? gen tet ent}; PPP 
. CLE 142 S ale n 3 1 1 1 eq wy 45 0 1 ASS WET © © F 
met b932:5ie; dan 2 fot heh nt ehriotfo ot yo bono oft bro: 
"7 s * A M 7 28 bn a 95 {5 he 
20004 OI ais, ano; Tor: 2 a St c 5018 


a — * 2 cw . 
— IS OO — 8 - n 
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od” — 2 — —— 
— — — — — 
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EEE 


— 


— 


9 des I Ut. oY 1 TEE me 1”: 6511 | td: | 


an N W 1 . Py 1 1 N 
e SECTION 85 Mah e ee 
5 7 X 8 8 F ha 4 r 5 2277 
p 5. 3 ; 
Y +. 4 © * 2 ” « * „ 7 7 * Se A 
N * ” 
- 


- wel e 2161 6144 wt} We + 1125871700 


Latitudes 


. 6. ä * nes Wy rr 


va 
8 

— | b 
* 
5 


of ths Stations on. 


acon, | 4 hs ** 55 28 | | e 1 WOW 
f 4 kf 24 N * # ; q i» 

"OL 3 $1 W. ; ; 7 * * F 8 y | 2 * | - 

* P ©» „ : 1 ® MI 2 ; 12 > : 2 V * 1 YN FE 7 4 wy 0 6 8 
Ee ——— — ROW — ones ws SA » Se 


— 5 78 43 


1 

& 

* 

PEPE 
0 4 
4 8 


Ma cf i ? "rt wo? 
I 7 "a1 4 
Fi 1 N l ENT 


rn 


and xxvnth triangles, published in the Philosophical Transac 
tions of 5708s and Lud. and zavth..of:the;Trans. for 1797, 


* * 


3 
ichn N 41H 
Satt lll. 


Black Down and Dean Hill. 
| Nine Barrow Do WI „ between Black Down and Dean Hill, and 


(YI 1 7110 41 7 it. 1 „ - 14 


147 115 


ow 5 ow: 2 hic h we dbtain the angles of u b tri 
0 n, constituted by 3 Nine Barrow Down, and Black 
The distance from Nine Barrow Down to Dean Hill is 
166497 feet, and, from the same station to Black Down, the dis- 
tance is 126783 feet, (see Phil. Trans. for 1795; p. 302, and for 
1797, p. 455.) and the wigh comprehended by those distances 
2110 go' 1g" ,25. * Pp between the horizontal Ane 
2 + nd thutformed by the chords is g”,25, which, 
110 go' 13%, leaves 1109 Tg 10“: computing with this 


Down, in — 44 in Devonsbire, 19, - 


Ta, © wh 88 — WE ' N 1 1 25 * * * ” . MY af, 4 
2 * N TY 7 * * * as * * N C55” 
0 4 45 22 Wt 7 4% 
4 k C . > - —. — 5 * BY 
» T ** 
- # = 
4 * 
* . 
- 
' 
> 
« * 
oy — * * 
0 — a 
8 4 % 
% — 
Fi 0 
1 4 
— a 
* 
* 


eng kee Sen wh 0 


T 


2 


* voſt 1 t aber 


fe 1264 il. ee 2 
3 AR 


5 2 | 2 , a6 - oj 
row and Devin Ein, (166497 


beet) Wa 24029677 feet, for the distance.hetween. Black Down 


and Dean! Hill. 5 a 1 r 1 8 Sto Sti Hd a Is 


zontal angle between Black. ——— 2 0 
The angle at mere ys ; Daneben and, Mios Rar; 

8 made in 2597, is found 

an Saar, 175: this, abe frm the angle between 
an | 5" 86 er mn 


ben 22 ou _ e therefore, the following went viz. 
( Dad buoys batgugs A 
264 Hae Hatt Den bo ee 211 
119% s unntse na-: ae cots 08 10 ee rade 
oiThe Aitande: between Dean Hill and Dumrinose!3s!r1$94.06/2 
ee) (BbobiTranaclonifygufio gay) = der rare Black: 


96% feet: these, appli tothe anges of lebe wage 


Hs N e ee, ih 


distance between — een. 1 oe "Held . 
\ GG, FE. OS. 1 Hill und 
Ot dot) Direction vfithe Mord of Black SO nk 
on the-18th-6f-April,/ n che forenoon} the 2046 eig (W 
1 5 angle between the Pole Star, when dt is" 7 H N bis 
9 ng greatest Apparerit de rent GClongation from the merit. 


e erg e, 
ond! beende 20 


nne ee s doe ei 


f April i t for 2ri00r ng ther! = E. oY 
E re eee 
n id:: N. Ne yn — 


8 ner th 3 bo wken fr oe . een 
1 


iy tu, Bats volldt off b ende, Sw y K. DFR 01 


and fo A = 169 26-35"ag; and 
Pole nee ae Wheroor nende ab 


„ 
* 

; 

q 
3 i 
1 
1 
1 
* 18 
* 
1 
of 
; 1 
i] 
4 
31 
} 
i if 
* 19 
[1 
' 
$1 
} 0 
J 


7 on AS AY BY 
8 7 n > 6 
; G6 * o 0 Eo LT 3 
NWI C Ng FLIES 38-444 e — * 7 


ward arc leery 


7 "iy gh ha e's 


: 8 N "TH * TOUS! tt . 0 0 Os IF 


Rand KD, abe pepe BG Ind HA, and; the,amall 


—— . — — = en 
@ reg teuer to the meridian at D, 
2 8 is — e and 


BF. and ED byin 


— BDC ; thranglaat-Di2 80 a4 e hen, 


the angles of these triangles) aetubcl to those formed by 
theVhidfes/ ure a follows 2 = = 1,).+ ML = = (1 Mee, 

vo = 8QH, 882 — wp "DD! Rees Supt Wh 5 
e 0 


r 
wy 


* 
5 


a a pt ; 


1 Af 75101 6, 15 


Stec % a | 2 We 
1 P 5 8 70 
® TE LY © 4 
Ire 0 5 ' k 
x F 
An 4 1 b 


552 cle Heme ein 


WY } 6213 1 otter 
= 1446,9-4 Fett 116ihinsirt 
8 10 ol j wo 
AB 27864651 % 


lit bk} 4 41 'E 


Again, in he two small triangles formed by. the: parall | 


in f e pri 


1488 


. 


CAN 


ag nd AR, 8 Md bad dhe * at & and A given.:the 


(.BEF 2 10.218 19113 
Wo 8 8 a6 st dal bei T8 
Ark tes lab Ar 


oli — 
E e ba e D635 5 = "agen: Al as 


2 2113 al 
Ad, ung 50 0 Ah f 


SOS p 4 OW 


4s 


EOLLLLSING ones 3 10 kan na 


There FD= DC+ CF . 2859.1 = 2500 
_ 8 — 2859,8 = 250047 

| tsidered as ueryi nearly 
of Black Down and 5 


ag that made 2 77 in 
| affords © * ln 1 


Tk T4841 


521 5 £ * 3 £4 A 1 4 = 4 x : * ö ; in, 
2 —— * 9 t 


from east an West 2 3 acoubs! fs Boll a 918 
m be” — space, 25004, 7 feet, — io 4 6%, in 
which I use 60851 fath: 


q: ; length of a degree of the 
meridian in;30* 41. or Phil, Be again ofa 


No the latitude of Dunnose 3775 0 and its | longityde 
1* 11 36 (Phil. Trans for 8 5 THT, her fore, 50" 251 T 3 
44% . 50* 41% 1370, is che latitude of Blatk Down. 
. 1 'This method of finding the latividescems: 16 be ie oh . 


by wphierical oomputihon; 


F 
| 
| 
7 
5 
» 
x 
| 
; 
i 
[ 
( . 
i 
5 
z 
F 
. 
* + 
. 
1 
404 
be, 
+ 
16 
1 
1 
* 
* 


a ava ae fv ih mr in 
$ 5&) Aa TC bh fitude, | 
"Dunhbieit Attoring: to the troublleconm 
method recommended by M. See, Ii his 
Traits Analytique este parens des'Cotys Celestes, the 
latitude of Black ND cbmes but 30˙ 41% 15",9;'4nd the longi- 
— 7g We je nay, herfors admitting the supposi- 
14698 Tor the Latitulle, A's git tor Alg zer gude, t 
| Black Down; that of Dunnose* 151180 wer cru 
ment of Gretel DUB ms), oleusnt a S103 ul 


| fie : 2 2 L. 18 we * Zi 1100. | 


1 burns) la olg 283 (noh 


Mk HA t td, Aeg we ——y '(S&61Phil 

bos0pfleat Transe hons fbr 179), And Plate XXX Fig. — 
Volume.) Inthe t o firt, we have the whole ange u Pilsden, be- 
| tween Dumpdon ahd BlackDown 2 152 97 rt; oh, which, re- 
| Udedd t6 Ul Achgle ferme BF the chords; bebbtHi&##$Þ* 9.245. 
The vides orb Laing date Durapdoni and Pflsden, Plldih 
. re $6 de daten, 


ä nr 


e | 


ro hog 439d — donfiof ain 101 e 48 *g21 72g. 
| N N 


ine, h 152 2 91 hf Dia 
Dow n 82 ©, 2887 i ot 0 % 
wy 1 «5041 Duwpdon! ls eee t onde Jule 


; lowing triangle: 1 Vd. babrronteansr. dae 291 
off le * — 1 44330580 
to 9113 bumper cee fd el 
LO 211 PWgk Dowd a5 877 tele 
of m Dump f he Bock bee rad * 
eee 10 bh . Bel 


card nit 


ACON is 45 if 21%; and 


tobe very early wwe hr 


Süssen end 1 ohtai 

d nobe li Rinn TEN e l 
1 eite, Ha nd, Bea MN. 
7.2. "pe re Rampen, d EL 570 0 99 lee eg + 
an ee JON Dumpdon to Capi Fr ape, x 46903 4 err 
e ane triangh „the gbgeryed Gs | Þ PROP 


wy 
5 ob ny en e ee Fe borizontal 


Dit? Ft WE: H er- 
eee 
angie be ROY 


1 C4 WRAOE a CET e n r LS 
ey RAD 1 88 i e 3 * r Y 
8 n 3 1 
E obs, 


1 


y 4 N n e 
3 


* 
St IE 


93 


j Ude this angle to that formed 
fracte — ong' > "4-5 


following trian — dine 
* —— Agi de Bog 
wal or 1 ban .cmibireocr 
mat Don a FI 


7 gt is ner angle betweettoRippiry:Forlahd 
— Now, * n es, five in number, used 


, have jo ; cen anc wn cg 2properly 


Diinipton/: bas been Fans = 15 a7 a (which is very 
nearly the dame as che mae — 1 > IE 


COMPAarIONYy 23 I N OT * n of, ; OY 1 Mie, 75 +, PRs Oc OJ 
re bernd hu 2 bn aids 10 tue gan Mar! 
Ne 


© 


fore, 98 2s' 8” is the Cooke Kipp Tor pts with the 


N DEN brian 101 


tude oj Reppin. Tor. .. 
the staff at Abbotghury and 


boot 20. ot Ahr tel Sober oc 


; 
2 — 
* N in 
f Sify mh 


Don, gs — — — wa q 
wol dd gf. gg 6 % lang ors zi & ôN 2p ert 
peil, 19d of it pf oth toes Lat 93 li mok obe lil 
e 4. of he Meridian at, Botgerian 26 ib 
On the 6th of May, ini the afternoon; the angle - Tae 
ene eren eme rwe ee its greatest ahεε. ot ett 


cans found abwody 905 


Mt we- bun A eee 


. tvorhin noi? 


wie a il 10 100510 


ed an eee Holl 


dmg" 


Me pats. Mn nn gin and the stat blots ,onct 


en ti Ab Gs "er Ay 1 — Wan 150 FOR 20 a | 


J Ee ee ee ns 
N hath a IIS 4 gn af 3 * 1 CESS IR 3 . n Hh Se CL n = 4 . bf POM CRE l * 3 1 5 n 1 = oy r 


Ball 5105900 18 4 0⁰f ä 
Ane e e ir bo 


5 20 TTL Ciba” pt 


| don oat, is' vx VION thi 


5 X . 4 : * 8 5 Cs 5 7 3 "2 oo TE 8 1 5 2 4 - A: be Wo _— N : 
PAC : III ee EE TT 
tw. n PS s . £ TY» N e FN og Ea 6 
n 20 Le Sa 3 8 


5 Wer Ter e ifs Mal Ot Hey 198 42.46, 48% 


tween: thewnerhdian a the auge on * eee Ball. 11 mo 


The angle between the station on amn Ten en Hemmer- 


56086 denne of Rippin Tor from the meidet 
400 r and Go84,y ſathoms; for 
lengths of degrees on the meridian: and perpendicular, 
Dede, become: 3“ 30 g, and g 180 Therefore, in the right 
herice Ltriangle BPT, 32 Fg) rein 


39 266 8 99 46 0e . — che point 


R. So PB=PR + RT = 39 26 0% + gig 3 


3˙75 therefore, the latitude of Butterton! is 50 24 46% 3, and 
Ir west fw e 3 320 a” EE TAN 


-dO 50 .nnofb19imumoH bis word. N fi ont 


Ar. . err on, of tbe Nixtance between  Hensbarr: 


5 9 I p Dc 26 = —— 11761 011 rer ie 


rr, . dee hn ford iy ha 10 


597.) The rn en Hensbar 
OW Se reſo my gi' 1g? i the 


7 2 er ona Soo —— — — — — - - - — 
= 2 32 - — — 


Actt of: A 805 
gf f. al Qcn b SUP. 22 


— hs THOT 
be ge, 
n Hensbarroẽw- end Rippin T 


— 4 nas "DE e If * #4 = 44 02 .f 


Bag ef 00 Ys 402 er 091931616" SR ors i910): rollt INNS 


A i, ei Rt a6: | Boo! 2h 
1sbarrow and Hemmerdvn, ou Ob- 
5 x) wh 394 mg + therefore 


ab the 


4 
pY 
\ 
1 
* 
* 
"== 
e 
we”; 
"Ma 
9 
yy 
= 
- = 
9 
2 
„ 
3 
2 
* 
wn 
. 
4 
3 
1 
1 
1 
4 . 
of 
Ry. 
2 
0 
* 
q 
"* 
8 
4 * 
1 
J 
3 
"M4 
"<P 
2 
5 
4 
} ** 
AY 
„ 
* 


r W's 
r IT» 9 r r 7 5 
: X 3 = l v4 — 


i: Wa 


LP * + o - 
8 + Lad XS N 
© ee ee e 5 by 10 


; . 5 5 th 3 n Se A IS 1 9 * F N _ 4 
„ - wy WS TIT OPT, STS eo, EO 5 > 
4 * * 1 INES n n e 
. SIE n n POET * 3 n * * ; 
8 — 2 oh 7 — wh, n 1 * p 


= x Fc 
2 7 7 8 S Er ue TE EI 
y 7 92 1 8 Ad x ICS S ov NIB „ 3 N. 
z 1 3 n * D 5 r n 4 1 £ 
edt CE Re SES as OE; , 5 
3 F303 : 


to be N $77 


borigrr99zs' Oro 51 bf 101 Fob: I891 133 bosg 1. If} 7 12 


496. eee f Stu Agnes cuts. that meridian, BHP A i 


ore, Hengbarmow. is e Rn its Jongi- | 
tude; meat of arne, 581887 23, nsgquently, along ude 
of G wiegt 8B162)47'>5-+ 58: 8 = 


81 05 2 7 A ee 2 An 2, 


9 — 287 e es e „ 67 Ke 
in the forenoon, the angle 210 OT dente 75 
ONE te ole i, Ser hen ee n. greatest auibgl; 
eloygatio mfr. the meridian, - aud the tft. _ * 
near P W was” | obverved, and ond , ores, 32 


5.3 2 38˙ 26 oy” 
| ebe . SOS] Ta. 44 0 8325 


rfl Half their gm is the ang] 6 | the maexi-,. m7 Hel 


% 


l. A stat ch fo een gel Ig btb 185 17.8 
1 1 Be angle. © veep, the Staff at Peranzabulo and, the station 
Henspar W,, Was alsg pbserved at the same station, and found 
beg 50 166) Grin Wherefore, 4 ng ug 2b 835955" >5 

= 78" 4 13“, is the angle. between Henabarrow.and. St Agnes 


N n, HRS I bluow hi * Of rtf Bp SAC] Arte 370 1 
fun 1. t oy 1 


1 morn e 211 91% bil : Hioag 


335 30 if ft tude., and fongitude: Mio? 4, A fence 


143 


55351 XXIII 
931111109 vials: 


.Þ 
F. 7 eng 


1g Plate MXN. Fig - 8. Let. A. he the statien at, St. Agnes, P 
the pole, H Hensbarrow, and B the point where the parallel 10 


4 


u angled ben riangle 9 


ae, for covine 8. ais: eie d 50 
44 384% 8 1 33 0 the 0o-latitude £ A; hence, 18 | 
77 th 77 of . Ae He" Wight, s T2 
Hensbarrow, is #l&6'fotin by a — ptopbriion 2 36 
54',2 : radius: ee aeg bine 9948 a8”: therefore. 
4 48 7 / 7 + 0 230 48% 3 2 HP; 97, % itbe 


8. —_ gre of rem. Ah wa ee ene 


— wy 4m Geog 10 oa. 


28 © A 


_m * 
"> GI 


| I have shewnz Wich Attértiör 
which th " latitudes and longitudes of che statiòii 


1 
e 9132. 2 8 2 BY: 


in which weden ith report ot 
If the earth e ogeneo 

5 on Oe, j and, 1 were Is diameters n the ee — 
MHtitüdes Fot plan df ove DIL 2 55 V y computed, 
provided their geodetical greeting were correctly — tht, 
ind'the/lafiulle ef eite stötlän im the series 


of ca 
Nec 2 000 7 amid t i bag. mor 18dec9H 11 2 7 


thecearth! $ vurſace. „With 


8 # £ , 13 "> +88 5 ; 0 7 I 1. # 1 
9 Jon 6 | > * 315 tet: a £5 
I 4:3) 3 1 O11 10 8 F? $2 | Inf 10 1 93 1 
* ; 
1 | 
I 
= \ 
2 
f F 
4 the Astronomer Royal in his reply ta M; | 
<> \ | 
Nr Þ er 440 
1 40411 


1 
5 * 
* 
* 
| * 
N | 
- 
- 
N ; 
* 
— 
ry 
- 
+ 
1 6 
4 - 
"IE 
8 | 
es - 
- 
— | 
80 
8 | 
2 
0 


Down to be go "41 19'S the tage et bitteren 


hg ante as donde Suppen, dlc, th 
latitüe & Gieenwidtito — — 


$ $I 5% « 
IIa v4 


| * 825 * $a , % 
; N I b 4 7 , 
8 an © "16S 45 "AI 7 * "el 
R A * 
1 9 9 7 
9 F p | 
o | * 2 | 
4 85 
© 
\ 
2 , 


"A 


have 


1 


deviated only 


.. 


9 
* 


N . 
. 

r + 
N 4 a ad - * 


N * 
i ets KLE * * 


2 


* 


Le. 


Hf 17 8 a 81 Y + f 
8 2 96 | 


4 * x 
* + "gafb 


4 wolf #5 
* > 


HO 


eee p 


arc. These dutu (thr 


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2 ve, from. eee to "ti 28', and. BND 172% 
- * 27 338 these give the angle BDN = ze 159“, 5, nearly, be- 
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. the meridian De, or PDN, was 33% ther ore, 87 36 0 
of 34 "$3",5,15- the angle a at 'D, between os ridian 204 the oa er 5 5 if 
Now, the difference of "longitude between B; Ad D, or the Angle at P. 
already found = 1% 20 460,4; and, aner by is very nearly = PD, and BD is small, 
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angle PD B has been ound. = 84 T6 54; 5155 5, i E 8 e | 5 - * 5 . 
55 33.5. the angle FON 6 . 2952 FSR 2.405 S8 
94 2 38,5, or. DBE, as angle at Black. Jown obtained ii 
en aner 1008s r 8 4 22175. 10 15 
probable, some portion of from defects in th ration madeę at Dunnose, 
on n the lights fred pry" Hy bay in yp oa lights were zeens and; as. the obs 
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of the angle. Auers rer Down, hetween Black, Down. te. 
is not absolutely to he dep poseß of this kind, althougt 
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2 53 L2 | 11 32.1 


Cbedzoy . :0233347 N 2 5 1 4% 
Higham W l 19 ＋ 0? 150 1806 - 2 an by 11 40% 


Higuan Steeplie + | 46. 001807805 | 2.45 4% n 147 | | 
Bridgewater Spire ©: 4 i En 2 4:0: 27-1643 Wf 2 59 30,7 11 58.5 
Somerton Steeple = 51 3 17-3 | 0 10 42,7 2 43 $1 | 
5 3 240. ] 99 2217, 6 174 
. 18 © 1 ok "I. | 
82 4 WAL 0) ITY Pt Fo 5 8,2 8 715 
Redcliff Steeple - Ce — 26 54.8 | 0 2 8. 0 N 2 13 5041 
Long Aston „ on” o 5 41,3 3% 37 
 Clifden Windmill — I J * 37 2527 
Blaze Castle - _ - __ 0,4 19 5 19.3 27 41-7. 
Penpole ( 719 7 31g 5 39 84˙1 
9 N 1% f. | 2 .3#-. $FeZ . 22 
0 9 99 2 22 23,4 


ple 1 


— 
4 


IT 8 888 4 — — - e Wee en b nn a3 26. td cas W 0 eee ee eee ee eee 


i | 8 | % \Names of the Oft I uind. +4: i — rom * of Greenwich. 


' *s 1 * 
Mac at} 7 razor moyt jets we In time. 
RA U.. ‚— ˙—ũṽ Le . 1 — e — — eee eee p — EEE ER 
; ö 1 N * 9 18 , bet &. 24% ; | fs. ; Wk 
: DB D ul 5 4 £ 4291 5 * i ; KR 3 . | f I 0 m. : 8. 
DE, owty g Spite 98738 11 | « The * 

Devizes, Stee £85007 5 "104 ; | 

. eh Bhat 


ret 


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7 A . 1 Ws * 2 * If ——— | "NE Fx. 24 2 f 
eg FFF e Gt: i 2 eee, : * 
; L.2 £5 1 5 {© PAY $4 21 ; . 61 2 Kt Ab 
: 5 F . 1 25 S. A. 4 
8 | | r ) "EVE from Lon wa west of Green ich. 
; CON of 5 7 55 4 Latitude. 85 
* 


** * 


„„ Butterton Hill., I em. In time. 1 | | 


{ * * x" W o 4 5 \ 


* 
2 
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Ga 
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| Hope Nove, rene, de 30 47 43.4 016 44 EC 3 | 
Waringon ceple - 350 39 52,2 0 28 19,4 W 4 21 6,9 
| n — 4304 4% 029 l 
| New Petherwin , — | $0.40 52,5 | © 32 15-3 
St. Stephen's: 5 38 50,3 o 28 32, W 4 21 20% 
Stokeclimsland Steeple - | $032 558 0 24 47,5 W 4 17 35,0 
Launceston Steeple '- [0 38 18,1 [0 27:543. 4 20 4,6 
N 5 aunceston — — 480 34 16. 0. 27 57. W 42 44 1.1 


FE 


8 
4 


* 2 38 25 
N St as ne . 0 n ee 


42 3 1 4 be ETA >. | | 2 West of G wich, 
Names of Den, |. Latitude, , {Longitude Fom ago reg rock 


1 3 


Fes 


is os , 
30 33 3506 
30 31055•3 
50 30 36,0 

Fn Co 3159-3 + 


and Longitudes of such. Places, in. the 
7 referred to the 1 di 


| $:20:281 5 
023 23, k 
57 30,5 E 
+} 13 $38 E 


& 


Ee SN Serge; = — 4 
OS St. Minvern/ Windmill £ TW 2 
5 St. Ieey 8 

| St. Merian 


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Gazebo, 235 gh L 
Markfield Windmill _ 
Breadon Hill Builc 

Newnham ada 
Deddington 


N 5 EN 


Adderbury 1 — 


F 11 4 
Round mn | 


REO House Wind 
ingrove Steeple. | 
Hardwick Steeple 
Luggersal Steeple, Bucks 
Granborough Steeple.” - 
Bicester 8 52 


| — A 1 | 


danke 
rayton — 
Highworth 8 
Witney Spire 

Bam Steeple 
Radley Steeple © 
Buckland $ 

Witchwood wo * 
Stow on the Wold 15 
Sarsden Chapel 
Bourton Cha 


© #3. 2 80% 
* 8 


— 


NS 


1 8 


* 


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1 | Wages 2 


7 * ao 24 * 
2 2 4a % þ < * 22 


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| Islip Steep le N b 
W St. pie 


ME 2 * Hs 


8 BY y : Y 
| . I p — - * 1 
0 en 3 * — , | 2 4 
2 £5 2 2 «.. — is 4 2 
2 75 * 8 = , - 7 


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51 46 74949 © 
51 44 11,2 
51 40 58,3 
31 40 33 
51 50 
51 55 4% 
51 54 16,4 
51 59 f 
52 8 31 176 


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. * In page 658, this Is, by mistake, called Breadon Hil Summer lose. 
* — , nnes” 


Re 


31 3 2, 
| 52 52 28,7 
152 2 2,2 

30 2 30,; 


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T's FD $3 "12 — "= 8 {tt 4 4) ; 
DO WO «Bi * N pets 40 21 255 e bs 
. Ines t. „ dee 8 02 1 - „„ otro 
ee, en; eme A428 we herd holla © Sieltt. Yo oi rity ad e S969 11 * . 
MY ace bells i gotblice eis 075 22 . e 


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: Ht? v8 0 Yai. 40} 228] EY 1 1901 f 435 4814 a 


70 'olgris' 9 
N 1 RA 1 


ith ! 9249 


* 


ii 4 11371 , A » 15 (ie 
60 x fort, and from the perpendicular. o698, 
7 anbtends; 2g, B. and * % Lee, 


. he latitude e, 
See in the Jear 1 


; follow 


110 8 uu 
N 


art 


8 8 2501 11905 "© IL. A ad; 10! gas int 
120 „ See b. nerds a 10 ðjax 9 
an e 201 1 42002 : nab 0.1 


FED a; 2. 


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Wa * 


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en ind it, 1 think it 2 the result of his 


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4 Fo 1 8 
vd air trete 
* A *% g * 2 4 o * . 3 ot” 4 
* { 


* ? 1 ; * Z 0 * * OTE . , * * 
rr 61 S 
12 40} 91 n by ATTY IE: 


Sith to Lordi, 550 7781 KT 


$4 it 7, N 25 
456 * 1 of 1 111 1 8 AM 


1 | | June zb, Mr. Mu pen clock® at Plymouth, fast for mea Ui 3351 1 

i 1783. 1 Timekeeper faster than Mr. Movek Geek 0 25 "5 | 
14th, J Timekeeper slower than I lock > on 4 294 

| 4 4 London bock slow for mean eme 9 e 


„ r. Mypcz's lock 

NW Timekeeper Joer Müh London clock": 247 2 
London clock slow for mean time 8 8 ö — 

eroienire reno 240 Dif e of longitude /i oft node6odgiceg 


: "00m gelt yd nuch Mean differente | 5, 4», grd6 38555 

1 he long We. 94 f St E Nl * ich, ac ü 

i, perhaps rixht n herr ves Abt NT. MN c transit, at R _ 1 

| ' mods by the late Mr. Biz, properly det up de 2 Piet Thick x . 
roy 2 7800 | enive work of hiv own bbs N 4 "excelle? j Ty 18 5 | 8 5 


MO 


8 ba PIG. EE 

n en 

Bs VS PEW bo 
_. 


therefore, the ee 0 * 


the same. e Survey, we. 


Count Buunl 8. 


| being used e Seems. tolmeke it. As tlie occasi | 


and some very remote point o on the western side ol the 
[St. Davic 's Head for Wtan ede u. ho | 


80 satisfactory naithe ei 


BH 2 


the 


"NE ** 


a 458 9 


af; 2 


late 


ell 52 9 941 10: wniad 21 151 Asibi1e lt! irtorlt: 1071. eld 10 I 


"od Narit in 9074-1 ſec Liard $4 ine uzigno! 2400 rei 


e Sten Le 


2 1 
ere 


8 WE; 


* 


5 


3 


= 


iait me get l jr hg 
subtend. N 
afl St. Agnes; 500 1 


220% 7197 5 


* 


un 


a> \. 


1 15 + 100.7 ad 3 


us 


r 
enen 


” 


1 


n 


* 
8 


page 608, it 


IF; ; as ol BrapLev's own words, in 


118 


ba] SS 


41 


-Doferoo eifdt n noitigt 60 OO off þ 


| perations, we g * 
it as 2 1 


* r lt C z oh3s | x | 


| 55 0 l 5 155 5 
| results ol which were 11 Liss tut 
; a- £14480 12375 ** | 
E: | dae zin rio value 540 37's 
| £5 f Arcturus. Corona Bo-': 1 54 rde 
= 1 © 11 76. r 
FF: 
| | "7; gave for t dare, Lit wh: 
ö A $308 od'4 21 poke eint 11k” 29593 058 28 gw bot 
| | 8 5 4 ard Fr ers * . ; ates of w 112 32 #16 3 L 


x 
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4 * [4 iv 
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ER 4k * n FEY": A 


» l \ + 4 - 
ialgoibriog 129 odd: Doctor NE „0 
＋ 8 Mr. WIronRl L. — 20 36 5 
tt: Wai I Mr. Wars 40 57 0 
| Mr. WitcueLL - 2 44 35 
5 m ν,5; 51 
| m of the Whole 2% b 1 
« * . . eye rt 1 
the account of the survey. 0 | 
In Ely Transactions for 1797, p. 08, 1 
a,” den it me Lizard ighthouse and 
IF determine the Situation of the Point. it=- 
FE 7 gd 22 EY, L ** N 
. the en: „makes an angle 
5, and | is therefore 636 6 feet 
N gy * ** A 
| 9 


% 


_ 1 


NE {ag 
n ee eripiz le 2009. Sin 


To 


Ns be right to use e the horizontal, 
hs . 4 onthe Hippo ir aft 
| ig the distanc | objects are, iven 


wY 


Vo 139} LS 14s 418 4. 2 „ 


s for 1797, p. 50g; from w ence, 
beg picks ans 67 {Bu Buryan 734 
-Martix Ne eff Serine eh e 1 9.98 | 


40 banden 31-0 SO" eee 


vie 818861 4 
0 = 


N 51102 2755 10 75 1's 998 ad | 
Ses, 1 1 dicke Ec e 05 ol. 


72 f 2410 


| Ban 8d AY PAR 2 Ro! v4 1 
\ feet from the { 143597 1 
| 2 (29 TO St. Agnes. T1672 2 * 1 


| 4 1 1 mcg . E 4a A, e We * | F F 
een I oe 8. 0 Fam 718 8541811 T9996! off 
| Bn A 92 68 64% WN neibiriog oft 
Ho 99: $89; IE bb hich gives 


4K 

* * 
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AB Sa a 


(1291 oi 39: 


| 2 bg 3 Ein 4 of 81 8⁰ 9821 


, WR 2 6 1 * Ne K % 
7 
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3 1 9 7 * . , s 1 ＋ 
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© hy 2 000 13 292280 a 10 nbi rl Sow * : 
y 2 2 Ri Merch 49 54 b 
ti [Blogs RA 150 54 9 3110 
1 "TERS ht-House® .. - u 36,8 
25 erg 2 ici | 110 <A An Time. 


+ by 


or 7 


SET abby 
ee Ma 


tude of the Scilly Lights is «aid to be . 56 07, and Jongirad ” Wn 


155 
e e FEET 
AA Tra! 1 PoE e 
8 


a 


of the nee ae 
1 he * oy 


5 


neridi . ait tote 


SiH LEED 
8475 043 


tur Shouts: 
ke obs 5 


— — "Ye 05 "12 


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erected over. the quadrant; was 


* 


TR en * 371. 1 
The 8t aff erected 


Aa 
"4 


let 25*'59 49 exe — 
ne K 


© meridian of Dunnos 


longitude 9 3, 9 from Dunnose n 
of that station; W e 210 50. e 96 — ee 
| longitude of the Observatory west ** 3 
A the Hans of 8 bee no o great aan from 
chat of Blenheltn, 1 have deduce the Iatitide and longt 

creep in, When 6 


py 


* 
a 4 - 


the former, to avoid the errors which 


2.1.38 4 . . 22 Eo fic in 


"TD 


135 Ei x Dean 1 N 


ö F 13 8 
ES 3 £13 int 21 235 4 9 5 4 * 1 


ve Hill from ik tneridian of ON Len. 


1 2 
1 * 7 


* 
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* 


from UL SENT 2 55S . ' 8. % 


EIS, by: rl 


arin = 7 


8 
2 5 $3 


IP 
1 


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Sth, 


Sees Feet; and Ain e 


Kad Wh * Hainer P2228 911 T9 


ne 2 8. 7440 


7 4 


51˙ 300 28”, +-for thelatitade) and v, 99:4 


8 *% 
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minatons may be taken for the true result, wie ata 
3 eee 
r . 2 e 7. 1 "a 125 e SY 


| *Being favoured by his Grace with ce dete and 1588 le 
4 FY mn 90 have the; lowing 


-0039biaer aig 


3 
» 39 #7 . 
FE S 5 5 55 : 


3 


MY TEA 


2 


. 


rg 8 a 955 0 2 30 Fj 
. eh ee ee 21 
1 he angle at the atation on jon 2 ah Ales on 
the top of the Observatory and the parallel to the meridian of 
Dunnose, is 79 50 51% NW: therefore, its distance from 
the meridian is 147 19 feet, and from the perpendicular 416985 
- feet. The figure repfesenting Atlas is 39 4 feet due east of the 
Ken Room; N no er will TA required 
he conljuted latiflde. . he pace 14710 fect 8 

8 17 e 16 


Tonginide'af | : 
for the hk 5 1 IN 29 2 for the . i 


3 ESI ar . N . | 4 ; — J 30 | 
Leet an dre" of | bebe Ale, 


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eee alten aun ww xc nolan vd ad anohagitt : | 


Hof mf . 


wy 


— 
r 
r 


TREE 


od 


* 


in 1794s for finding the length of a 


144% Horne 971 
- >. 4 \ WA * 


* 
% Sy 


lin g cn bets. Moher Ded alt Jo dn ads 
axed. I qo end eee „WH * on, ei Seon n : 
835 YN 18ludibooqroq ofls _— bas 3 ett ei IDIOT 20 


Mi} 1953 AEST ID. 5981 eee FH NS 21. git atT 1255 


- 11 1007] 1118 155 


bunte ace ro, tiene 1b I alan adT,,. 


| brill _— od Ui iind 


2986 17:3 


7 Wa 


ted, in th 


7 


* 


lr 432 1 1 £ Ba 8. * 1 bn 55 tins! 1 1 101 


Fat 1 vun be convenient to treat ol dhe operations partied on in 


— Rey 's,). the view to 
Sary o gelect A: maine: 


__ 


wo 0 . 
= + © 


LE SLES 
<8 


a 
CEA 


8 


1 


8 * 
83 
1 


5 ee EH 


PRE 


"av 


DIY 


7 * 0 * K : ; | : "2 :, ; 
F197 %%% 1 


4 * n 


5 Tower to the old station at 


t 1 in the dane ct given "by: General Pa 
8 an allowance is made for the error in the reduction Xt 


CE N KAMA? Eat Yoo 


PPP n ee — ES * en 


in the quryeys of 1707 and s. 
Wi be distan ces 79960 f feel 5 feet, and the included | 
94 190%, 3, we find 


distan te of the Flag-staff on 
Seve erhflroog Tower, fromthe | | with 
t eee, a part of the fo 


— 79944 feet; 


* 


| owing __ have their sides 


5 + 1 THe __ 1 * e 1 
2a S771 To din ATE #01 Berg 1 3 630 . VS a . in . 3 F 


5 4 


ART. * Mans Friangles. qe. io es] 


Gvexcnid"* e e $9" 


. N k 195} 8; Fn F þ = 54 47 25 8 52 ' 


Hadleigh Steeple © - [43 11 51 
Lengdon Hill 3 | 


5 8 | 30 24 19—21 
41 4 22 


POS ug wy * 
ng * 4 


OI 
#78, + 


andy 3.1 1 


* 


the following triangle, viz. 


S 1 Wig. . 
1 4 — N ' 
: F D * 
wo, "Wo N a 
85 * i -« £ 4 OY 
4 ” 
; © '% * * | { ot 1 RY 4 
. — * * * 4 * 4 a» 
; EY 4 | 
the true . 
& * — 3 * 
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Tuo find the distance between Langdon Hill and the spindle of 
= 
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My — enen eee 34 I 20 9 0-74 _— Men ogg A es og 22 bt What 4 8 hes « 2 4 "My i 
PS 1 A e e Ne Gr WAR Gl ere, tag ate I NP ac anions „ 
Langdon Hill 122 2" 40 — : ada 
: y * 1 5 f -4 . a 
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2 4 * * * q . A ; gs 
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81 1 2 PD „ *. 1 $6.4 1 tf oh . 
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5 ; 5 , bh. at "+ A WP IAIN V 0 e eee eee e eee eee 
ry 6 . * . : 4 
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a r ; 0 Sore tg; os * * + . n SN 5 5 
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4 „ ) ; 1 n « . * 39 x" l _ ; PEW ET 4 8 * 2 ; 
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7 . 12 W = * — — * Fe S et eee eee 
2 F ; 
4 — . : y 
2 7 % 7 f N £ 725 . 
- 4. a « 8 by k * "7 7 8 1 
= « 4 131 „ 
: . ect. «I wt wy 7 1 1 & 

: , c > 24, 2 a „ * , g 5 & . 4 — PI as * 19 2 I 5 
2 ; | | | & | ; Lo Dy, "HY WNT 
+} — 1 . 4 * 4 0 
of ; * . ; 4 „ F 4 2 A < * - ” 1 4 * 

| | | uadri the spindle on Tower 
: # & v 7 4 e + 1 W 5 y a & "ty 1 0 . 4 W * „20 Sr 1 —— r — 0 
« . 
. * - - 3 n * 
ati £ a „* — r er 
n 4 Ll + CF Mx : 

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£ » - — . 4 
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4 . 4 F + + rods =y d 3 Pn uy Ne N 
* * * 9 4 
i * 1 * * KA X wa = * * = 1 1 . 2 * 3 1 b —4 
{ - i * p EL z 4 2 1 
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| Prittlewell Steeple _ 


®» 2 ; - , l , q | 
777 ² er, CO "I +4 + 1-450 
4 ; — 1 e 


$2 9h 


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ANION ECT Fr Is SA rows ire aus i iſs Ed baits De OY 2 DE te e ps; $14 a OOF TR I TS ECO TIEN Rauen 
1 6 2 | f } 5 | 
; &- * ames Stations, ; ' " 
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=: £1 bas „ ot 4 
l D Wy 6.5 * — 
. 
ff . . : \ 22 1 
hr 4 5 : 
= - . ylei ower = 
ws ; ript old station, 1 . 
1 4 5 4 % 5 e eV" e 11 a Ke 8 * X a 
1 N ene Y * ..->. . 2 oe gd 
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eh | — - 12 22 
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4% i 8 "IR - 4 gt - ; | 
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11 2 2 | 2 a * i 25 x 
I rip — old station - 100 2 | 
4 ks Y 8 1 
6 a 5 : 7 
J. 7 f 1 4 * 4 
4 Ti am + teeple =» »- | 20 1 2 
i { „ * "> N ; 
4 il I i * 
| $24 av > os K oe en his A es ud BO 4 hes tg + n ee * 
p 0 * 
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is ; : 
Tillingham from 3 
8 a „ — 
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18 TT * 2 Rr 
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A? * ”} Fs 7 wen * F * 4 * 
4 ; | 5 
— - 52 
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— = - - 39 - , 
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l er IN i ce A gl „ 4 be ng t eee > 0 S Kors fertile: F. Force. 198 8 
* ** 
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_ * _ 
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as — 


— 


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x 
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1 1 1 3 


- 


12 | + Great Tey 


* c 9 2 by fd 2 Ay" w A * 
Sto IRE 


—— or I 


Obgzerved þ.......- 


* W 


a "Res; 358 feet, 


2 — 


—.— 


4nd Stoke stete. was + found tobe 0 


$4 2 2581 


28 Suni 5 K 


2 


| ** 


— * N r . anve.+ wad 599 
— * o 


Little Br 


11757. 


. * a » S * 
1 1 


— 


[2 6 TT 1 
91 77186 


x * Le * 8 60 


An 1 ' 

| | W 

Staircase, Fe. Mary! 8 Steeple, Col- | fp ee 
chester | | - | 


FY * 


Stoke ts e # 
St. Me þ Colebester - 


” * ” 
br n . ey © WO 
7 


Tattingstone 


1 


Fa = -4 


The distance from Dover Court PIER EM 


3% 


87 


mere Steeple to Stoke Steeple 75955 feet; e at Dover Court e is 62˙ 


* 
5 


38 20%. These dire the distance of Dover Court Steeple from Rushmere, 50921 feet. 


"POS" 


1 ; SK. < 
r 


nnr 


- 4 1 ” 
4 q x ” * 
. 14 ; 

» ; 2 I . 4 d H : Ys 8 
wing, 5 R 5 * „ 
3 e *. — 4 7 4 1 
3188 * $424 1%; 2 25 7 N #4 1 <*, © ag 
3 1 5 42 y W . 1 fy * . K F 3 * „ "347 TR? Ty. * thy * - 4 84 I N 3 

* * 4 wy : N by 4.8 * E23 


* " S : - © 
. 
Dorer Court n 8 wot ta "SS $$ IN +: £0 . 
— \ x | * 


” 
* 


- a A 4 } 50 7 10 
 Rushm Wo Abiidge” * — hd ab 
1 | ere r 3 WIEN» 6p i i . re 
i 9 S4 i 3 
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E 2 x: _— Tp 
| 8 8 © — $113 n 
f Y 
FFF. ˙: ˙² ¹- "I OE 
. | a — > 3 a+ a ——15 k᷑Pͤ —2ͤ444„%7 
Woodbridge. -_ 
þ | 
1 OF © 141 f — _ 
hs 3 A 
- * e * _— = =—_ 4 
Ky N nite; _- * A Cn — * ————˙² ;. 22 „ 3 
* 
+ 
. | a | 4 
: ROOT IR — a . Pas — my 
= 
Falkenham 1 8 PRO. 
OY Light House 
ut ey * * — 
; F 1 * 
Orford Li 7 Howe a — 
| bi ; 
: 7 —_— Wal 
WR, e — . — n 8 —— —— On 5 — ——— 
— — — 
Rusbmeres | | 
bY 2 J * ' 
Woodbridę 8 5 
ge = ; 
Otley 8 | *. 
4 cy teep I EIS tr # 
; ern ; 
N . 1 IQ wt 
4 
1 
— 
b — 3 1 
4 
op * * Hs, Well + tags 
+ : 
We: 
3 
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1 1 f 
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w e . 
T Obelisk _— 
Be” a 4% 
bs : . COU e * 1 ' " 2 « 2 8 24 : zo N — a Jie Kb — pe is (90 he 934 e e eee 4 . 
2 . & ? i. ER 2 * —— — — 
* *4 ** Y | 7 
AX ; : 55 #2 
: . p * 2 4 , + i ; ” wv * 
Copdock -« - 
* at — = * — 1 
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* — 
- * . 32 
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4%. * 
$; 
aol; * 2 Hue 0 Wo tr. 
EF N 13 5 
; | Of: / dl 1991 e © LN q291g mio? £7 
682 1. = * £7 : 1 1 33 Es EF 56h 0 25 * 1 Yap 00 3 = 22 1 r ** \ 
$603 | * 21. (79415 5 F$TH% & An . , tA 4 102 Mr! — 210 14 * 22811 L „ 908 88 
. 
ff 


N Elie Neat 


* 


2 Its nth 


OE 


IX 


E RIC en LD or ter oe * 


b 


Soutbweald Steeple 


Danbury. - _ -» 
Triptre, old Station 


K. 


* 


ab 
ad 
- 
* 
4 
. 
* 
: 
{ 
: 
F 
54 
* 13 


hy. 
=, 


© EE, EE Fo x7 


EIT 0 


| KS 127 1 . Ha 
ö E = 57 5 Broad Oak Steeple | 1151 


4 9 n 
Fe kN & wh t K 
n pe: | | . 
1 1 1 \ 
4 « N 7 


| 3 8 
e e en 74 q 


a 


a Z . * 1 . j 
" . 12 4 3 


* 
— Spire _ 1 1 


1 1 


— — ves. rn — 


e Roding 5 Spire _ WF 


\ The angle ebe from the dhe on Nanhury Ree bs b 1. 
e and Thaxted, was 30⁰ 33 40 40% this, with the including sides, 85094, 
triangle: /// ͤ EV I ie: venkes 1 N 


- 
% 


.-2 |}, Danbury Tf 37 7 40% r E - „ (lov 
y — *** · » eee een 
Tee 5 Hatfield Broad Oak 92 hos N 54 ate 


* 


n 
. 


WL 


„ 
Meransen 

. Y + TH. 

„ 8 * ” RL py» 3406 "© 


A 2 


sides Dane N 
5 ION en e 


N 5 EFF 

f | 4 

Er 80. 121 ” — — N N 9 Ci 

A, $2 6 £7} =" eee Die amt 
1 ; al | * 


WE © Thaxted =- Wh 1 


tea rp. ot - A hag e 


tance ted i Stoke, 


Rog bid 
, which, with the distances of of these latter srations from 
Laveobar, 48039 and 124430 feet, gires | | 1 
ee PIE RES. — enge! 
440; | Lavenham - 610 yi „„ 05 
N 68 . 2 | | Ya 2 * 4 


— 1644 1 23 


, from "In whe find 115480 feet to 5 


ne e * rut 


r 


dC 


= 


Heath, and on Highbeech in Epping Forest, to which the great theodolite was 22 as 


. 
. 
* *.% oy 
y 4 * A 
* 
: , 1 Jon Hill. * 
<A or ret 6p r * wh. Hate 3 4 6 V 3 H 
„ *% 


og Tover, 280 58' 10% and F aides 
Tower and Langdon Hill: the first is 


4 


d * : : * L 1 * * Wo , * 
5 © Sout Mo! 00498 - , © Pd 


2 


12 45, is had from the included - an 


ions wager in _— 


ever! Tower and South 
3787 feet, and the 


0 ; ; 2 * * " * 
5 nnn HY : . * * 
8 n KA 1 C IO OO TTO WeSe, 97 8 EI 


— — — A 9 A r Ei bs cas þ aw r 2 *. n 


* 1 ; 1 © * ſe 
2 3 ” . a 4 * N p i ; 23 ö » & * ar 
7 1 — * q A 7 1 83 6 1 1 ' 1 4 t5 . * o& 1 
" 3 0 2 4 7 J 8 * 7 <> s I © % 
N * > * , 
* . # - 5 2 9 k x, . 
. 9 * * , - 8 — ” * 8 * 
{43S 3 * 5 8: tha 7 * 5 1 5 . - 1 N LN . = — : 
* LS. Ts * — 5 iS '43 N 8 . - 9 47 wt? 3 {4 ? * 
* , 2 1 34 a * 5 7 
2 . N hg 1222 — BEES Ip ON, $1430 | n 2 2 — 3 8 
— — . — 
K * 1 N 5 * 
Yo] ” 1 5 TC Y ” N £ * 
8 WY Yb * BS 5 x S AY a 7 * "EE Y « 1 A 4 * 1 
. 75 \ 13 \ 1 * n , * 4 x * et * : 
f cs = * . K 8 8 h n 
1 7 © 1 F * * 5 — — 
Se vernd er e 
5 * : * * * 5 9 
1 ] 11 \ - — «> 83 . D'S 
8 1 9 1 ” 
| wt 3 * ; as 
t K 1 * ＋ * 7 4 " 
v1 my 
: . , 1 8 WT 7” „ 
* 1 b 4. 5 
E 6 4 ; W 
80 thy cal mY i | 77 
* * * . 
. Z 82 1 A 84 
« gf w . s W * 0 
. ; 2th i 4 FT 4; 
” * 


1 797 eee eee 


SA 


Foot of the cross on the dome of St. Paul's from the station on Seve 
wu Tras-for % K %. 


an, 


* 
2 wine LEY Ren 


4 - 
2 2 — * i: 
1 * * y 4 1 2 % 
5 3 : " 2 * a * * 
* ar, a. os a. mY 
* 1 4 #7 © aff 1 
3 a — i 
* n * n - $ ; ** nk. e 2 * 
- 7 
Ro * * 
0 . 
— * - a * 
TE * F 
f v MX JT "to 8 1 
a» Z * 1 1 7 1 . I * 
ws. x S «+ 7 | "4 * . 1 8 $ 2 
: £ > 1 
13 , , — * $4 ; 
* 4 7 2 « 
9 * OHMS ” Ez TE 6 . s n Y 8 
+ * ES £ * 2 2 
3 1 x , 
A „n * 
* , « bay » * Is 
* , 2 * re 9 San * a = yt, > 3 „ 64, 44 £47: 4 4 . ö . OA hr tn 2. 


I * 
4 

* 

+ 
* # 
. 
* 
5 
* 


quthweald @ = 


32 


* 0 * 
1 1M s 1 — , 
* 5 1 a * * , * N 
7 1 X 4 N. * lr 
g - 84 : 
K * 
i 
- 
Ee - 
* % 
* ws, 3 
- * L ; 
— i —_ 
— 
* — 
4 * % 
N * 


1 "Fg c ke c # fa ld Mill gen er R 


8 8 
3 : Fer = d Keep le to 155 33796 feet; td, ir Für de Da W froth the 
| | . 8 Wan be tween. 0p 0 r he BI of Sd. Pao AA Sevetnitraüg Teer But 
= | | | 73791 feet has ANY found by the triangle, which i is derived from the distadet becher cz 
= ED latter station and Wrotham. A dees dt bet on del f Bunce, n things: consi- 


1 . F . eee ee 3 


£57 a S147 py ak ap „ 36) Yeo biotin 
"oY FFC 


N * £47 By 7164 
, * 2% , 

g By 

: 1 * 

U * 1 F 7 4 7 4 4 

| «$8 * E . — 
o 
* * 1 . * Ly * 
* * 2 PS INE.» £7 3 $ * LI. — 


=_ „ | . Sante, . ot alt goto ol 
5 fade 9 Tower 


* 
PN WR. $2: 
* 4 


1 


4 5 —— Spire 3 


mw Te | Sererndroog Tower - | 
A | | | Hempdoad. Heath mort bog + 


* oh * 1 "+ i © 
Highbees 1 wr i EE, N * © . No e 42 


As it 8 necessary to ascertain the situation of a Bigh Batag 4 Beam: 
' which, for distinction sake, I shall style the Gazebo, the n 
; — | the station on Highbeech, to another farther west of it, as Some trees obstructed the view 
. E 1 of this object from the former, To get the di: stände - from St. Paul's to this x new station, 


- — - 2 

— ne 
_ — 8 | 
= DN — 


— 
pry S * - — 


— 2 . N IN TOY 


Fe berween it and the old one was yueagured, nd found = nn r e 
8 1 old Wale "66 HY Ot 
5 „„ Highbeech, new station 113 Sa , 
Sa, R 5 3 SS Sa T4 . ent. 
34 St. Paul's * 5+ | which gives the disfante from 


4 St. Part to the new station n 61738; FI | | | W. es 


TT ENTS D 2 
| | Highbeech, new statirn 1 
L | .  Berkhamgtead Gazebo 
5 ER 5 3-7 


2514 | 
Gaze a = 


VIS GE AS ²˙ EEE 
4 


; * . 8 n 7 me” p ' . ** 5 ; 
. ** 5 0 
= cw <= 7 ITTIPOOO Bi Fan iT fe Free + oe $3 


24 * 9 7 
. * q - br * 5 N 83 7 * \ a \ : 
FEES * * A 4 . e 
te 2 3s 4 a 3 —— 
e » Ps PTTL OTOL 5 VAR CE LO: 
a > w 8 % > *% * : 
| Feet. 
1 448 


1 117049 

Stand. of I A 
At the new dation on Highbeech, the the” an an Weis . staff on the Gazebo 
at Berkhamstead and the old station — observed and found to be 14 47 * 
This angle, with the” measured Wi ze stations, and Alto" the distance 


Highbeech, old station 
Berkhamptea Gazebo 


Broad Oak Steeple | 
— Gazebo 


* 38 a nnr * 


rere — eg — 6hhn wp 9 


{ 1 

F 

** + 1 1 8 . 
* _- ky Th 
= * 
* * > 
s 
9 * 4 


R A F438 Nef 


Mn . 
22 


Hatfield road Oak 17 1 


Nateing Steeple 


Hatfield Broad Oak - 
Amstead Gazebo - 
Henbam on the Mount Steeple 


rar heater} bag A „ hreyrfi iff Fre ne Genn ano $13 {it Bans 311 


Kees 


Thorley — 


nn PTE 5 TRI WWW * 
OTE AT M. e iel 


** 


a * 


1 7511 
Henham on the Mount ; 
Thorley 1-544 2 - 


; b EN $9 2 23 
> * * 1 % oy tt AS wo Haag * 1 Wk 
g 8 E * —_— x \ Yau „ ISA $$} F420 5. 
' 64 4 


81210 2413 


17816 
42169 x; 
DISITIE: 1 | 

9 , # 


A 


. 4 ; 
* 
—— 7 
7 i $ p 
1 5 ' 
N : x . „ * 
— p 45 5 4 F 
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Henham'on the Mount 
Elmdon <- @« =» 
Thaxted Steeple 


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1 
8 
1 
9 


. Balbam Steeple 


was, 4 
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12381 £ 2 


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| Elmdon | | 
Babraham Mount — 


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4 J r Fas £ + $4334 $>\ — : A N 


: 5 Triplow Steeple | 


©"The angle at Henham o. 


"ys 10 44"; and the. distances of the 1a 
; a and 22988 feet ; from these data we have 


r a — +; 


n the Mount, between Hatfield Broad Oak and Thaxted Steeples, 


N , 
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Westbam Steeple „ 56 15 © TPerry's Mast House 

N ast H Fic: e, . 0 419 70 7 


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Canewden Steeple 
Prittlewell he 
Little N. akerin, ing Steeple _ 


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Station on Bank - . 
Shoebury-ness 
Canemden — 
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Foul- ness "Chapel 
Rayleigh - - - 
Peldon ' 5 
Foul- ness Signal 1 Staff SO 4 ; 5 
„ Fw HOI: ER r ptr WE. © GE 77 ere — ure AA 
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Tillingham Steeple  - 139 21 10 b. al Staff 5 
Peldon | - «795-44 $9.1 f- Ns 
Signal Staff, Tillingham Grange TS 5 3 


Bradwell Point | 


4 
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ARS 


— — — 
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Tolesbury Steeple 


* 


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Tri , old Station 
Altborn Church _ 


Tillingham - 
Althorn - CL 
Burnham Steeple 


CO r * 8 1 ; . * x Ee 


Tuling} 


Lit Major Steeple 


1 erv( Sewn Diotanoggoitzs Yo wants)! | 
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NO AY 185 v5 38 
33% f 
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Little Oakley e e ES 
de la Hay Steeple 


Dur Gotre - 
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Rigs Cov Je . 
mere 91 3 
Harkstead = $54. _ 
L 2 EN A 
Dover Court | 
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Rughmere |  - Ws 
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#43 2d 


Danbury p * ; a 


4 EP, £5 £4 4 
Tri Nr new Station 97145 


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5 6 | | 38880 
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Danbury! - 
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7 8 9 1 
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Harde 33 Oak . 
— — — 


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— 


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Gall wood. station 
Roxwel! Steeple 


3 poo Station” | 


Rading — 
—_ Steeple 
el Jeep! 
rot Steeple 


he Ow 


— 
74 » 2 
1142 U 

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Ab 
301 1 59 les Hoghurst 


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Names of stations 


. . 


3 » * 


Epping _ 9 
— — . 


Tbeyden - Ba 


Navestock new W, indmill 


4 * ** * 
. 7 ; - 2 
e 
le 


Thbeydon Mount 
- Theydon Farnon 8 teeple 


Southweald = - |, 


de... 
Theyden Garnen 


Hevering — 


Mie 26 ee 


19 


5 | Seperpdndog ower — 
| | | tation — 
QE of a Bouse e of Woodford _ 


[51340 


uuthweald . ; 
þ by 8 * d _ & 
Ji ch 8 : 7205 
0 * 7 1 4 3 00 A 
131% 5) 1 Yo. 1 2 


3 5 Ruins near Ilford 


Hightnech.  -  — |, 
Chesbunt \Station 


SHER... - «= 


4 
oa ane Cas rere 


| Naseing Steeple - -— 


. 155 „ 
. 5 | Hatfield Broad Oak Steeple 
Harlow — 


_ Hatheld Broad o 
Sabridgewo rth Steep) e 


| | — Alhbury\Steeple 
_ Great Hadbam Steeple | 


/ 


Es 810 d Gazebo 1 os | 
Berkham ead Gaz = hi 83 
— Steeple ES 
Rs Stecple — "af Proghourn 3 
Brozbourn Steeple © ; 10 n 
I | ; = £ " — 


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Henham on * 2 — : 
1 17 Fel $72 D d I . ; 
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3 29109 molegu depr. 
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Pet? at] ley 1 & 0 5000 „ 5 OY 5 de pr 
10 er 1 A F 8 = a TR ene eee 38 . 


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80. pt uss Farley Down. ON ' noo nobagd depr. 10 x 
p20 4 ww Gan rg borend 15 eite 12 05) Ara: 80 & 


N x 6. 3% * 2 2 Ry } W's eB A 8¹ 4 E 
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i © Weatbury Down. " 4 1 
The ground at W Hil. 


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ras 3 Ab. -- - | 


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21 0 A Ceran 43s: Vids W 18 5: fog UP 
; Ig Fr Hi Es A ; £3 
an. Beacon Hill, Ane bury: wibaoM 4 
In WMP - © vibhuet _ 4 36 HE 
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CL £1 
5 2 58 75 2 8 


„ ert. | | 5 2 
Wut HoneHill || R ele. 1 36 
Fs : Ui Brill on the Hill 18 


The ground at Nuffield at es We * wp” 


> Qt aw __wealw + _*T- 2v0bnsW 1s lev! 355 h | 
de 5% Bow Brickhill  - + W 7g depr. 10 4 5 5 
88 2? b Epwell © - © _ Hf 2g3 90 Mid, Abr. 6 57 | 
. e 3 — 1 : 7 6. 
vl 51 05 + 5 9 — 3 t 7" go rund 1 . 5.45 
28 $1, 3d; — 3 - Nuffield. Hidond wol 3 
Ihe group at White Horse Hill - - BiH 7 depr. 4 45 
Top of the Staff at Brill on the Hill. Staff 131 feet hig depr. 6 2 
* 28 A » Bagshot. -- ol, 1 depr. 6 43 
i de depr. 4 12 
1 dre: 
N. B. The half ag belonging ne rent foci as modus ation . N 0 


en 1 . TP : To Wee 1s bnuoTg' $4 
at Brill on the Hi hp 


ns Shotover Hillßdd | 
bt x0 ee | Bow-Brickhill _-- «4Þ: 
5 80 VVV 


White Horse Hill - 
Broadway Beacon 
8 Brill on the Hill i — 1 f 
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25 Þeill on the 1 ed . 
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alk 


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debr. 6 39 
-  depr. 11 51 


„ elev. 8 31 
150015119 V+ 62M 
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N r 14 25 
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whe 7 
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zþ a  Arbury Hill ky & i Gory ETI vol 1, 1 
855 3 Uithed: de Bot 12 holbefleta ge 
depr. 23 44 


Rey. aignofad ge 2 Us Lad 27 iT Af off 


8 wauba⸗ N 
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8 by * 1 « 2 A Sx - "a, * » Nr — 93 1 > i + * 5 A * : ry 
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— — 5 Fro) > — 1 ; Id y +174 LY 7 : * . + 7 : 8 . 5 . 3 : ? 

— 5 N - 1p , * A 7 7 7 

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55 . 155 821 WE FT”. Aen. 455 Feet. 
5 were! A Dat kn i 0212799 . 
* hs 2 e 2 * den Nr 193 8 $0 wude 97 {IS 43 op > EN 
| | 128 rd det he 6 „ Nan k 8 790 105 5 | 
YR TO mg 5 D idee bet bc! tne BB; 1b © 1 0 
3 ; | F arley Down „„ Brod YE N Here, mm PR”: ey Mee: | | 
* Moor Lynch „ 0 „ #voQ1 . „ache „ 


Bs 


LIES 


2, $4 
| Greylock! 8 F 05s -· xay 2 ige en bnd „„ 
Ash Beacon — "Fo py nooFed x: 9 a bes 162; md ___ ob fa Fark EL a 
Cadon Barrow 5 hg - _ (Gin >; — i», HOLT ? a - . | | : 
| | | ud * + #4. TE 4 3&3 #45 4 — 
5 Brewn Willy e age * ve op 32 
Inkpin VV Ng 


_ . 14 *. 


4 1 * "it 2+? 22 FE ; 0 a ; ; | . 
28 _ Nuffield | * og RY Ws 43 dot * 1 Ja Haun 85 1 N. —— > 2 245 I 8 . TY : | 
_ White Hare: Hill. „ een eee by th G 120 _ e 


My * 
ae Hil (Brill oat £0 20 STE) bg 14 221 1 115 my 


od 


n Hill wh: if ave dl: b ra bas h 376 43 


>. 


* f nt | . g 2 * 4 4 : Pony 
20 | Wendover, ground * „ ip Kas 905 
Der B 3 Wh, * WT. * ; . % —_— = 011 = 83 
15 25 „ noi n 340 8 $34 01e ; 1 
. —— / %* 4- _ * 4 > 7 1 4 . N * N 5 4 . 
 Kinsworth: J . ĩͤ ß 1 Ba b Kist 1 5 
_ 6 Sor ons Wes * 115 FI W . | 
Stow « on n the Wold_ SG * oa backs 
| | Lt 
| Epyell Hill - * HT an MIT 227; 
* II'S n 4. 345 EIS. 
; wy 2 - , 1 a 1 Y v9 , ; 
"wire Beacon * FFV | i 
$1 1 1 4 POE .. 7 9. f * f £ i N s 
Et ira, nnd og a nr Soon ud + = 
* 


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"Ps - 8 1 . 1 þ £ : ; 4 , 1 : W * 37% Ft 5 
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& Ar. xLIV. -Mean Taran 


— 4 
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„ _Hodmip Down ies Font, 41 2 4:11 026 

3 Bradley Knoll and Westbury Down MizT ee eee 1-4. 1, - | 

e Maker Floats 669 hs Vous — thi b , e Kidd wotth 3 WE, 9 8 

„een ot Agnes 8 do Prove . 1 Re ro ge ; 
Moor Lynch and Lugshorn Corner © 1 | ; 


* 


at 


Hensbarrow and 'Treyose Head 


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| CE Down and Mendi - © - Er wapyt -, 

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: . decem an webe Down - „ EM AN 


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\ : | - ichn 544 £44) bond 
„ Dundo Beacon and Meudip” ww - TY 
% 1 a f We” . . TM as 
Loch abd Mentip g Ogg» 


P Lansdown and Mendip 6 11 204 . 01 5 

, ** Moor Lynch and Dundon Pecos RS 

PT + hes 1 Dusda and Mendip | — „ e wh hy 1 of 
: Westbury Down and Farley Down - | - 2 
| e St. Stephen's Down and Black Dun 1 
8 | . Moor Lynch and Dundon Beacon „ vy 

| nen Hg 
5 | „ ©®Moor Lynch and Greylock's Fozs-way © = "Ve R; on 
Pb, ror en rc; e. NN, a 

- ®Cadon. | of the sea in the direction of © * 

| V wods bang v0 1 5 
cento in a northern direc tion ” 7 ; 19548 Wet ** 
rin and Nuffe˙l e e 
5 N 0 | e Epvel and Broadway” „„ 00 us 49 * 5 
N 0: 4xighclere and White Höre FIill. 
N uffield and White Horse Hill ” "3 e 
© +Nuffield — 8 OE WE 
Briton S0 5 the Wand F . i 14A 2 ; 

,, Wendover and Bow Brickhill 8 „ 5 88 15 


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OD e and Bow Brickkill = Ro 
WE ; 5 | Bahotover and White Horse Hi ns „ imba, . 
= 1 R well and Brill bas You VA: us FORE . 
Wor Brickbilt and Bell I 4 LOR nge. . i 46 15 
) : W oye Ne C268 7% 26. FO Eb > u iq An Hits 2 548181 1 Poe, 
: 7; wt bel a TT bas ao2638 wag 18 - , TY . 
. Soledad Bond 8 modegud bas dong N 400d 5 8 
| e _. <2 | beztl rover bas vorudunatd. "RY 
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5 ; | 7 | — — ; | b 
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. — — Hs res N 5 5 0 : ** f —_— OG 4 * 
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ME ! 34 &. 5 n K enen ©" : FB ER h 8 * 
4 ” bY $7 oe 1 n een © . 6 1 
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Greylock 


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of the 


m Lugshorn 


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— 


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—— ——————— — — — 
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survey: but, as the 


* 5 5 14 W F * * 5 
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_ way 1 from the latter otation t to 5G > 


he altitude of this sta- 
tion, Aeduced f thats Tabs Head, is 49 feet: 
eee pht of the bank on which the 


feet for the height 


Bridgewater Bay. But this height, the fall regular, is 
proved to be 84 feet. There is, therefore, a difference of an 
feet, granting the whole of this to be an error on the side of the 
surface of the moor at Bridgewater 
Bay is several feet above the surface of the sea, we may take a 
Or. 215 re, þ for the. error; of the computed height of the 


5 4 N * 
* £ * s 
1 n ROS * £ 
* 
2 5 
3 ap of 2 — 
* * ＋ 4 +: «a + 
is 
* 


1 | 
£3 $6 I@ fo 


eie Aar. rut. Matters relating to Rej 


The 23 ti contained in this account, like those in our 
1 Papers, tend to prove, that when rays of light pass hori- 


zonitally, and considerably distant from the surface of the earth, 
they are less bent or refracted from their rectilinear courses, 


— ive —— cumsti —— e which render 


. Aa a : 


ene level of the sea at 


4 » 
. 
t 2 ; | | 
4 \ TY 
{4 We 9 . 
VL * 15 IN 
l : > . 


8 ; 


182 * 


it ble. are as „men! to. r ee when, ae e vf.der 


was. neee 10 my care, L. Fee the 8 ” mk 
mining, in a more accurate manner than had yet be: n done, 
the refractive power of the air near the horizon, To: devote 


much time to it, has not, as yet, been in my power.; because a 
more rapid extension of the survey was an dest of r 


” XK 1457 instances of strong \atmosphericdl refractibi Hive been related; and inge - 
niously accounted for, in some of the late publications of the Royal Society, L think i it 
right to mention, by way of note, a very extraordinary instance of its yariability. . KY 
In the month of June, 1795, when the Instrument e party were stationed at 
Pilsden Hill, in Dorsetshire, on a particular day, at about the Hour of fouk; Tem 
played myself in observing the angles of depression or levation 'of the surrounding 
hills. After I had done all that was necessary in this matter, I turned the telescope to 
Glastonbury Tor, and observed the depression of it. The air was so unusually clear, 
that, desirous of proving to a gentleman then with. me in the observatory tent, the 
excellence of the telescope, I desired him to apply his eye to it : this he did, and, agree 
ably to a desire he expressed, 1 again took the depression of the upper part of the old 
building, which I was enabled to do with great accuracy, and found it 20 different: 
the first being 30, l, and the last 30% Phe unusual distinctness of this object, led 
me to keep my eye a long time at the telescope ; 75 and, whilst my attention was M gaged, 
3 perceived the top of the building gradually rise above the micrometer wire, and $0 
continue to do; till it was elevated 1 figs above its first apparent situation ; it then 
remained stati- and as night drem on, the object became indistinct, The folſom- 

ing evening, Lobgeryed the depression again, and found it 29,500, To. y what ans. this 
extraordinary change i in the refraction could be owing, F am at a 1058 to conjecture. 
The former part of the day had been warm, with little wind, and cloudy. The thermo- 
meter, at the time df obse 1, was 65%, and bontinued stationary for a conyiderable 
time, The sky was cloudy, but yet, as I haye-befors observed, the air was remarkably = 
Meare, LF he top of Glastonbury Tor, I suppose, is about 200 feet from the surface of 
dgemoor, over a considerable tract of which, the line joining Pilsden with that object 
Passes. The gentleman of whom I speak, as being with me in the tent, was —— 

Dancer, ol the Royal ö — remembers the circy 


* 1 


importance. T did not, habe; lose any opportunity which the: 
rec 75 the first was, when the instruments were 


subsequent season offer a 
at White Horse Hill and Whiteham Hill; the second, when one was 


Stationed at Brill and the other at Arbury Hill — ths Sy 
portunity offered itself, when, one party v ar O! 
place and the other ar Wendover. a® 1 2:07 B08 
on these oedasions, the instructions'which 4 . to 
Mr. Wooreor and, by-which.1 gov erned Myself, were to observe 
the elevation or def 88101 Gf tlie . jeparting.s Station at the expi- 
ration of e beginning at six A. M. and t to > have the _ | 


well regu l 
him also to be ey — endelig en his b bes the state of the 


weather; to keep the instrument properly cheltered from the wind; 
to be always cautious to adhust hs level; and also to insert the state 
of the air, as to temper: — — by WP the thermometer 
and barometer. * e I 5 
During the time we were at the” to first stations, White Horse- 
and Whiteham Hills, thet re Was only q one day when the air was suf- 
ficiently, clear for the purpose; this Was the 6th of June. On that 
day, the followini go observations were made at the. same time as Shewn. 


is Ls ” 1 
* 


nid. 


3 
id 2 
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4 


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93%! 41 1536" * GORE rr K r de + 


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f e „ E — Wa ic 4 l | f 885 4 8 + + | 
Ho Wh. H H. Ba Thermnd — f TIAL A8- IR | 
urs, 7 Grse rome- nd was; : PIO : Re £ . , ö N toy — . Li ds 1446 Yip 


A. 19 Hevated 15 Rev $: #2 0 N „ | 1 i 6 $7 4% 
en is. Fol Degr My 
if: . Wakes at e. | Sun not gabe, remarkably cer 


5 
938 
888 
— 
327 
— 
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Bito 1 7 14 Ditto 11 5 ditto. 

* Ditto. © 44 : Ditto 8. þ K ; ditto. 

* | 1 29,732 58, 85 . Ditto. tn Ditto 125 5 1 

1297280 5% Ditto. Dit dito. 

29,732 57 Ve ns 1 Dis, but 8 | | 2 
6] 55,7 | itto. Lamp at Shotover very eight, Dew 8 

| | Ditto. 5 | to, 


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Ditto. | Sun 2 5 a fittle; ; not $0 Gas. | < 

Calm and clow hn} on 

e. Fins a tt. Lamp * Aitine. 
"Dit, box 125 e al dag N 1 


— * — 


2 "= 
1 20 Fa 


Light airs vun. Sende but zun n chning w now rand then, 
- "Ditto. © Cloudy, 07 
Ditto. r | oe COLE ITT 7 FD 

. 7 Ditto. Ditto. 2 FOO, 


Ditto. Sun 3 a Mels, yet free from n any mer 
Ditto. Lamp 0 Brill perfectly 


* oy} 


- Remarks 


« 
Naw 1 D e ct — $99+. <9 ket ny . 


4 z 


—— CY. 2 PFs + 1 — 


29 FE 12 7 


Light airs at SW. 5 pearances of jain froin BW. G 
Ditto, Clearer, bac cloudy. Arbury Hill W. Clout 
Ditto. More cloudy and equally clear, - jd or age . 
\Theairremarkably clear andthe from tremor, - Cloudy all 
Ditto Os 7 ditto. More clou 5 


* 3 5 __ - ditto. Not sd cloudy. 


A * rege 


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Trigonometrcal Survey 1 1 : 185 


The u wm 1 which offered, was at the former station and 
Wendover: the observations were as follows. 


Thins Len . 2 


* — 0 
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+ BY 
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% * p 'W- : 4 ik as 
EIA r 7 
PR #- . « 


| 1 74 


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ces, and there. 
deat Rathes dathmiatiier;n ining here 
{4 D. N Air nn "dit, = 


Ditto. 2 x * 
Das. Ri. un l a little. 
N f 8 * 


8 perfectly distinct, 
24 — 


| Watch r 
ii . | pike 5 


18 mm ; «th: 


z Wee 8, cake egen and Han, 


Ditto, ; 
Is wind, and the ee * n very distinct. 
> | Lintle vl. oem SU IN Bee... Ditto. 


"who $a parties. were on Kroadvay B Bo and Cowell, T1 place 
them lat, „ I a them inferior to the others. 
8 Er =, — Weich regulated. 4 8 5 


— "SE EPUB 1 


— aa did — TOE EF TT r 1 8. +. Mt 9 


„ 


gn, wies d. | Cloudy. Much 1 


5 
bh © 
&. 
£3 
3232 


__ 


1P.M. 6 Ditto, but calmer ; v4 ng =: 6p at Broadwa 
2. 6 14 fes 69,3] Yery calm, and'cloudy all rou 
3 } 6 20 9-0 59,0 Barde Appearances of rain in BW q 
401771 5 it 2921 you 37 Foggy, but Kaak * the tent at dd. Beacon. 
Broadway + Beacon. bed 26h, 2799. Watch en 
Hours, — — 5 333 „„ 
„ 3 Degrits. | 
2 [19 o f 57,5 | Light airs from SW. Inclinable to rain. 
1 1 19 3 $725 Ditto. Still more so. 
11 $75 | Ditto, but r. Barometer tube broken. 


* 


A Iᷣo determine the refractions'on/t * mere White Horse 
_ = and Whitcham Fills, v we have the distanè between those: stations 


3 


1,4, f 


MN 118 S515 my "DET War IG 


5 . EE. 1 5 
2 5 he depressions' 
excepting those which are marked wiyt 
Horse Hill and Whitehanr Ht; la 
1 5 1 and 10: der wars are wett un 
| | Brill at g 1 first inst ; , 
(the centres of them) 14 Fg donde 'df Mheifespec- a 
5 "tive instrumems'" and in che last e Vi 1H 101I101¹. 

The height s the trinkiticlestope bovethe grounds always 
8 „ feet; therefore, : an. | owance m wust be made, a at cach Statten, 
+ -—- ſorthoangle ee 
this premised, .the-vefraction will be found from one of che b to... 

© following rules, vir. A contamed are, anc t 


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YUNG \ivyriio monogyttl | 


perceive them to have been: aa 215 


1 3 — — ——_> a 


between. the! f At, fl. 
The air is not often clear — Sur mb fie 


mulous motions, for these delicate ob el r 178 the besen ; 
and, as care was taken, Iam of, opinion an ks, f more than | 
3, taking that of the arch of altitude into 1 the = cannot 


have obtained in any of the angles. Thie re 4 


and 10 0 clock are less than At "the dnn os; ; but | 


e WI tent of the 

pression of Whit Hil, bon the other 

Station, varied tittle a thos hours, "The SC. chan ges ing in the ob- 

Wirketjam, (497 dnd 33, being the 

abr) without 5 ones at: Et White Horse Hill, 

prove: that some 5 alteration, from fl De yn Strata, bad taken c 
han Whoeyer con- 


which this "tl 7518. G5 3 teak variation if it one of 
the angles, "ily the BY LEM remains the same: and 
this suggestec tlie itlea”: Any 4 0 Ste collusions 
in this way, a long series py 0 1 would be necessary. 
It furthermor "appears, that des "could not. wcpused these 
differences at—Whiteham-- Singe 80 cause would 
es aß hite Horse 


— 
PF i 4 
L 2 4 
„ 1 


tiens at 9g 


most accurate, on account ef the great distance betweem lie 
stations; and alsg as mare.te be depended on, from the circum- 
stance of the ray generally passing goo feet above the ground. 
The fourth arg afforq another instance of the refraction 
varying ste Ong station and renmniningl ch t atthe-dther. 
This mo doubt, was:awirig tor the:ivterventicn of se par 
tum eb ain, nenen wall thar BrowdwayyBoacom! [[Flie | 
 Fefractippa,gdeguced-fiioita these eantemporaty aboereations: ave 
corn inge lr The nean reffrations(neglerting the 
fourth arc) brought under one e b N N 


b „ White Hors BIl ad Whitgham, 794. 
* H. and Brill, en e be 


5 771 . eee A0 wh 4 * — ISS] 


If the air had been in a quiescent state, previous to and also 
at the times when these observations were made, it might be 
expected that the differences of altitudes in the stations would 
be obtained, tolerably near the truth, barometrically. The re- 


marks in the tables appertaining to the first and second arcs, 


Shew that such opportunities offered but t w8e which belong to 


the third, prove the wind to have been fresk; and, as the space 


between the stations which constitute the extremities of that 


arc is 34 miles, nearly, it is not to be expected that a true result 
should be obtained. The differences of alti 


constituting the extremities of the two first As öde ind 7 
means of the observed angles of elevation and depression, as well 


- 
— * - - 
— — 5 
— - det te — 


— — Hr 


2 — 
— — — 
— — 
* * : 


1 
: | 
| . Allow 500 9901121 11.9992 15 8 $9998 110 88 170i 
| 90 Dürener! e bg fenos% 
3 ein bats 4991 dend In nes wir 91007 * Done 
Survey. Ito" 2 101 51. you! 8 188 
— — — = BA 2 . 
1 8 D oe ode Wer 
1190 II. oel 44 „00 
— — * 
9 . 


2 4 | 
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92 fe 98 4 
In Tage 457 


— 7 — 14, for 1792, read 1772. 5 
Hala hfHHN O evormmg Av T1992Ryp 5 i PREP bad Tis 97 TY 


of arlgicn 3i abr S E£0186V13200 Wc rarer omit at” 3s 
bluow ethste oil ii eoburitls to eoMeriAib dy 1613, of 
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8915 —_— bas Tia! aniiigneqqs 29d 219.111 CeBIT 
5 ee ke ho aint ioggo dau tad vole 
| 591 2 9115 28 £13 9 9verl 0) brotyr 41 I Dv 111 a3 4171 
ien 10 17 Eo Be aH g99wiod 


| 33 ws dividd it lte o_ 


hoo "BY Bann 11115 N 


18067 40 eite ns of 


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il 10 299317 79h E Y * bon ido 90 Wiuorde | 
722 12 111 os ih 10 2 νEeõ,jjx 2111 afihutite £02 


lives ttölte nien bog H, T1029 2 rl gwmdo 2113 16; ann 


by r ——___ _ — ͤ—A 
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X and parts ofthe Amn 


r EO THEO III Ft 9 Oh IE <P I LOS 


—— —_—————_—— — ——  —— — —— — EE. Ee ee EE Ae TN OTE 
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Ion. trans MD CCC.ZlateXXXVl. p.728. 


—— — 


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ACCOUNT OP THE MEASUREMENT 
| or AN | 


ARC oF THE MERIDIAN, 


BXTBNDING FROM 


- 


DNN OSE IN THE ISLE OF WIGHT, TO N 
IN YORKSHIRE, 


IN vorn oF THE OPERATIONS CARRIED ON ron 


THE TRIGONOMETRICAL SURVEY OF ENGLAND, 
| IN THE YEARS * 1801, AND 1802. - > 


BY MAJOR WILLIAM MUDGE, 


OF THE ROYAL ARTILLERY, F,R.S., - 


INTENDED AS A SECOND PART TO VOLUME II. 
ILLUSTRATED WITH EIGHT COPPER-PLATES. * 
FROM THE 
' PHILOSOPHICAL TRANSACTIONS. 


LONDON: 


PRINTED BY w. BULMER AND co. CLEVELAND-ROW, ST. JAMES” 8, 
FOR W. FADEN, GEOGRAPHER TO HIS MAJESTY, 


AND TO HIS ROYAL HIGHNESS THE PRINCE OP WALES, 
| CHARING CROSS. * 


1804. . 


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— — ˙i—— . ⁵¼!N... ] ˙ Ar adeaddoeaats 


. SECTION FIRST. 


Kran for fixing on Dunnose and cafe as the extre- MY 


mities of the Arc * — 
General Dexeription of the Zenith 4 e 
Particular Description of the Zenith Sector - 7 
Manner of adjusting the Instrument for Observation 
Laying off the Points, or dividing the Limb of the Sector 
Adjustment of the meridional and borizontal Wires = 
Particulars relating to the Operations of the Year 1802 


Particulars relating to the en Y a new Base Line : 


on Misterton Car 2 * 
Angles of the great mate oberved 3 in * Years 1800, 
1801 — — — — 8 
Neduction of the n Thighs 76 8 
Recent Comparisons of the standard and working Chains 
with the Points inserted in the cast Iron Bar = © 
Calculation of the Sides of a Series of Triangles = 


_ Clifton i 5 _ — 
Observations made on the Pole Star at Clifton 


a 


and Dunnoss - 
(Note) Demonstration of a Formule for finding ths vun. 
— e * 


r Dunnose and | 


page 5 


6 
17 


26 


Distance between the Parallels Yf Latitude 2 Greenwich Tate 


ous 


— . 7 . ,, tr BA 4 „„ „„ 3K = 
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' SECTION SECOND. 


nity of the Arc, with the Zenith Sector = = 


Operations at the Station near Clifton, the northern Ex- 1 


tremity of the Arc, with the Zenith Sector - 


with the Zenith Sector 4 A 


Table, showing the Runs of the Micrometer-arew. over | 


every & in the first Degree on euch Side of Zero 


Table for converting the Divisions « on wand Micrmeter-bead | 


| Operations at the Nearton on Durnose, the 500 thern Extre- - 3 


Operations at the new Station on Aua ee, near, AN 


into Seconds l — * b 
Table for supplying be necessary Corvection: to o the Pio 
Zenith Distance of a Star on Account fs the its: 
or Contraction of the Axis by 1* of Heat =; vB. 
Reduction of the. several Observations made on 8 nd Sw 
Draconis, and other Ro to tos youu: Day Ul Jak, nt 
1008 — - 12690 
Deviation the Cross Wir res in the Focus of the Object 1 TIL 
Bye- glasses from the true Line of Collimation 100 
Amplitudes of the celestial Arc, compredended by the n Var 
Dunnose and Clifton — nes 
Amplitudes of the celestial Arc, comprebended by the Stations « W 
Dunnose and Arbury Hill! - Joe. 
Difference between the Parallels F Latitude of Dunnose ih) 
and Greenwich © - * 10g | 
Zenith Distances of 7 | Dro, PI to the ROE of hog 
the Year 1794, from Observations made in five Successive 
Years by his Grace the Duke of ManLBokouGn 106 


L * 
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% 
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* * * 


Subtence i in the Heavens of the ferent Parts of the ter- 


restrial Po 


 etermination of the Lengths 7 the Degrees « on ; the Meridian 


- = page 10 


e 


in the middle — da {os | ceveral _ 5 wht one, e 


 Conclusion - 


4 


Being of. the principal. 
Sc. from 1 the Parallels 


" ApPENDIS. EF 


Stations in the Counties of ewe, .. . 
10 the Meridian of Greenwich Mk 


Bearings of the Secondary Objects TN - N . 
Bearings of the principal | Stations of the western Parts of be V 


Kent — — 


8 122 


Latitudes and Longitudes of the Preceding Station 1 


1 


- - — 128 


1 


LE 


6 
* 


Triangles for ascertaining the meridional Distance between 


— . "IO = Rs a - 4333 2323 * — — — 
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3 "PLATES, . 


Gt Row of the Zenith Sector * e. 


Section of the Zenith Sector tbrougb-tbe Plane 2 its Aris N. 


Elevation of the Side of the interior. Frome MT the 


Zenith Sector = 2 XJ. 


Sections and horizontal Views of various Parts of the Sector XII. 
Elevation of the Plate carrying the Ys, SY e XIII 


Top of the external Stand, c. 3 XIV. 


— 


Bir rg 1 c * XI. 


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_—_— 7 . 


In page 19, line 13, for G, wal g. 

— 35. lines ; 15 6 from the bottom, for 430 revolutions, * 446 
— 5, line 3, for 45 diyisions, read 4,5. 

— 113, line 28, for 133758 feet, read 802548. 

— I. line 29, Wn” _ Ji read 68 


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Ix the last account presented to the Royal Society, I expressed 
my intentions of making the operations which were to follow that 
period, subservi it to the purpose of measuring a portion of the 
meridional arc, runnin g from Dunnose, in the Isle of "_ 
into the northern part of Vorkshire. In the account referred to, 
(See Phil. Trans. for 1800, page 56;,) I stated my reasons 


30 adopting that resolution, and my hopes that Mr. RAMs ů⁵E HTC 


would shortly finish the zenith sector which his Grace the Duke 
of Rich MON had bespoken of him, when Master General of the 
Ordnance. As that celebrated artist, from the beginning of the 
year 1800 till the middle of the following summer, had pro- 
ceeded with little interruption, except from illness, towards its 


completion, the whole wWas brought so near to a conclusion 


before he died, that'Mr. m_ found no difficulty i in rendering _ 
it sufficiently perfect e Me eee ee e PNG 
It is Proper 1 should state, more fully * I have formerly 
B 2 


* 


. * moe dE Ne A oe ¶ ˙Umem— 2 1 m re MW. EixqT $40: 5 a 
* * . * . * \ I * 2 I 1 , * n n * 2 
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done, my 1 reasons for selecting Dunnose as one of the extre- | 


mities of my meridional line, and also those for preferring its 
_ meridian to any other; which I shall do as briefly as possible. 


most accurate conclusion; for thee 


of the meridian which proceeds from Dunnose to the mouth of 


| . 


An Account of the Measurement 


In a country whose surface, throughout its whole extent, is 
equally diversified with hilly ground, that particular part of it 
Should be chosen, for carrying on a meridional measurement, 


which comprehends the most extensive arc. This arises from the 
necessary consequence which attends an operation in a country 


so circumstanced; as, possibly, no spot fixed on for a place of ob- 
servation, could be supposed free, ſrom the effects of the unequal 
attraction in the adjoining matter. In such a country, therefore, 
a measurement upon the most extensive arc, must give the 
n arising from the cause 
here mentioned, like those of observation, lessen in their effects, 


on their application to ares of inareaeing magnitude. 


If Great Britain were a oountry thus diversified, _ * 


digible part would. be that where the meridian. from, Lyme, in 
Dorsetshire, passes northwardt into Scotland. The difference of 

latitude between that place and. Aberdeen, near to which that 
line cuts its panallel is 4 475 nearly; But, however great the 


advantages attending such a length of arc might be, under 
the general eirrumstanoes of accurate terrestrial measurement, 


and accurate observations at its extremities, no beneficial canse- 
quences could be expected to attend the placing of the sector at 


intermediate stations; as the arc would be found running, almost 
every where, through a country ene wh * congl- 

derable both in magnitude and number. wh 
Under this congideration, I determined to measure een 


n . mn I bad eat 


C4 


e kene 


-..Þ 


* 


ſents of the Me 5 


longest e arc, in Britain, free frog any anden ob 
dane And I was lad to select Dunnose far one of its extre- 
mitzes, as observations made there, in conjunction with others 
Green an. would. enable me. to. make corrections of the 
itudes of places given in our former papers, if faund neces- 
ary. By fixing on Dunnose, I hadlalso the means of ascertaining 
the distance of; the Royal Observatory from the northern. 
southern end of my line, and. uently, of 
with the parallels of Dunkirk and Paris. 
Dunnose being fixed on, my subssquent urs were 
eee carrying on ——— 28 nearly as I pos- 
sibly could. in the direction of its meridian, selecting the stations 
8 that their sides might be properly inclined to it, and of suffi- 
cient length. In choosing the station at the northern extremity, 
I was careful to select it as near the meridian of the southern | 
one as possible, and lkewise in the neighhourhood of some 
epen n of ground, proper for the men 


Cor 'Y Gt] . 


[ © 7 * "'% 
T. IJ. Y * 


: Clifton, a Small village! in the vicinity of Doncaster; and a level 
of sufficient extent ſor a hae, an Nigtgrian arr, in the northern 
lune Lincolnshire. 
In the composition of W I wish ce rel to 
dun mat of my operations which relates merely to the matter 
expressed under its title. I am possessed of materials sufficient 
for another Paper; and shall give about thirteen med 
triangles, principal and secondary, when next I present an 
account of the Survey to the Society: professing this, 1 shall | 
now say, that in 1800 and 180 1, the angles of the triangles con- 
 8tituting the meridional series were observed; and that, in the 
latter —— hace was. measured on the abovementioned | 


ER Merit I nn = © $I 3 
1 * 92 


rr ton et? na oe NOS. 


i 
| 
1 
—1 1 


4 — — 


for 1795; page 460 5) 60 the 


been previously made, the sector was immediately em 


: Wo Durindee, uo ear Phil.“ ans: | 


* 1 after neunen nene of the 
verification in he: north, I had the happiness of finding the 
zenith sector nearly completed. Little remained to be done, 
besides the dividing of its arch; an operation which Mr. BRE 


to defer till the following spring: it was then divided, 
and the instrument, being otherwise complete, was delivered into 
my hands in April. An observatory of convenient form having. 
Tower; ; and, from thence, with the permission of Dr. nn K. 
LYNE, it was sent to the Royal Observa ory at Greenwich. 
It is now necessary I should enter into a minute detail of this 
instrument's construction, giving a description of its several 
parts, with references to proper drawings. If, indeed, I had no 


other motives, I should perhaps be induced to do it from justice 
to the merit and memory of the i ingenious inventor; who seems 
to have en ed 


his talents to the full extent of the hopes + be 
gar of dee . _ instrument he rst of! its kind.” 


© 8 


In chiyvecn 1 am- wales alextvibs, Nr. has ob- 
| ng the inconveniences attendant on the use of former wectors3 3 


% 


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s - 
1 - 
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— 
* 
4 
— 
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oy 
9 
* 


ich he has founded. the several improve- 
: ments, consist.in the mans of wing th Fan tube to its 


Janis Aeon; — a an | only; way of dene 7 
the face of its arch in the plane of the meridian. Another circum- 
stance of moment was, some contrivance: by which the iS, 
"= should be unn ae; over . the centre 


Jabs The 122 nn the ingenious art procured, hs 
applying the same contrivance which 80, eminently displayed 
his skill, in the construction of the quadrant belonging to his 
Grace the Duke of MaRLBOROUGH; a contrivance by which the 
plumb- line can be as readily adjusted over the required point, by 
a person standing on the ground, as any adjustment, or other 
act within his reach, can be performed. A description of this, 
as well as of the means by which the instrument is rendered 
vertical, and otherwise correctly prepared for mene will 
be given, with the assistance of plates. . 80 
Plate IX. Exhibits a general view of the sector erected for 
bservation :/ it consists of two parts; ist, the frame which sup- 
2058 the apparatus to which the sectorial tube is attached; 2d, 
the work constituting that apparatus, with the tube itself. 
The external frame or stand is made of mahogany, and unites 
strength with simplicity of construction. In shape, it is an ob- 
truncated pyramid, whose base is a square of six feet in length, 
and whose vertex is half of it. This frame; although light in its 
make, is yet, when united by means of square-headed screws, 


* 


fctuntly/ Ort,” thats this hollow ond u — 
ſmme, of the zame zubstance, strong and well made, 


which is suspended che sector; nis frame being dupportel at top 
m every lateral direction, and sustained at bottem by a cone 


An — the — 


1 


resting in a metallic concavity, the figure of which may be ima- 


gined, by supposing an arch of a eirele to revolve roum a 
angeht to one of its extremities. A cylinder, in the upper part 
of the interior stand, finds its plaee in am opening of an octa- 
gonal shape in the exterior frame, and, by a simple contrivanice, 
is retained in that situation, while the sector and apparatus re- 
volves on the cone. Thus, a ready means presents itself f 
turning the instrument round, with the face of its divided arch 
owards the east or west. It may be steadily retained in any 
position, by clamping it to the brass work of an azimuth n _ 
attached to the bottom of the external frame. + | 
The direction of the meridian, at the plas ene 
having been previously obtained from double azimaths of the 


pole star, tis instrument admits of being placed in that direction 5 | 


very accurately. - A telescope, twenty-nine inches in length, is 
attached to the side of the great tube, or rather, may:be:ooca- = 
sionally placed on a frame permanently fastened to it, having 
its axis in the plane of the divided argh, and very nearly at right 


angles to its radius. On the divided azimuth oirele below, the 


. angular bearing of any proper object may be set off, by turning 
the sector round till that object bisects the urdss wires in the 


tle telescope, and then noting the vernier. If the axis of the 
sector be horizorital, and the interior frame set perfectly upright, 
the instrument may be turned round from one point of the 

compass to _— and: . Miao wg ae ? 
a few minutes. 


_ 
* 


- 


one end a lens, and ne 


— 


into my han 


£ 
eee eee 
ents acid; nate ey (Plas I.) Þ anal 
Shortiy describe this part. bn 

The telescope of the sector is antenne ſeot long, e 
an object-glass of four inches in — It * attached to an 
axis, similar in shape to that of a. tre 
ear to the tube an rran 
Work, carrying a thin and diaphanous slice of 
having, as appears to the naked eye, a dot upon it. The centre 
of this dot is by construction the true centre of the conical axis, 
tly of the circle of which the divided limb is a 
part. It is unnecessary to say, in this place, how that diaphragm 
» 50 aGjusted as to have the centre of its dot where it should 
. Tea tr 1609709 8 
crew ag 2 the cone, eee nt „ . 
zen found ee sinoe » the sector came | 


. Fx . J 
* : > x 1 
1 


— 


- 


As the axis is hollow, a Ugh as that of a candl, held at is 
Open end; is transmitted through the 

—— 
nme, lens at eee * 


middle of the nun ene circle,  Theongh proper 
the. er and under p arts 


— 


Ip 


Wien Foo construction close to the dot; so tha 
. through the axis in this way, the plumb- line appears bes © 
small black line on the face of the mother- of: pearl. 


1 p * 
n * 4 "a <> 5 4 N 1 r 
_— —— — 9 wat rs Ar — p - 
a — _ 4 > 1 "IE _ : . . | — — 
I - — ä _ * A g * N _— n - N . 
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of the Meanrement ed FL 
„ by looking | 


Now it is evident that, to an eye thus placed, when. the in- 


1 is adjusted for observation, the plumb- line should | 
appear as if accurately bisecting the dot. To give, therefore, the 


observer the means of moving it to the right or left, when | 


5 standing on the ground, (avoiding thereby the inconvenient 


necessity of elevating himself on steps as high as the axis, Mr. 


Rauspx placed a microscope, about 5; feet in length, parallel 
to the telescope, on the outside of the interior mahogany frame. 
This microscope, bent as it were at right angles at both ends, 
has one of them open, and placed close to the pivot of the axis 
carrying the small lens. In the upper part of the microscope, 
and just under its roof, is placed a speculum, inclined, at an 
angle of 45%, to the line passing through the centre of the 


Sectors axis, and close to its end. This reflector receives the 
converged images of the dot and wire on, the illuminated spec- 


trum, and transmits them down the tube of the long microscope: 
the rays, falling on a plana-conver glass, at no great distance 


from the bottom, are finally sent out to the eye by a prismatic 
glass at the end of the tube. Thus viewed, that which to the 


naked eye above appeared a small dot on the illuminated lamina, : 
when magnified, as delivered below, is seen to be a small and 


well defined circle with a luminous area, admitting of the most 


accurate means of deciding on the right position of the plumb- 


Une, by exhibiting small portions of _— between it and my 
_ periphery of the little circle. 


The mode of illuminating the ee axis is 8 inge | 
nious, On the side of the interior we frame, and opposite 


— at. 


ie vertical mieroscope, is viopot ett a Lindyp on two arches. 
Ar the back of it is a hollow cylindrical recess, in which is 
placed a polished metallic segment of a sphere. This concave 
refflector is attached to the cylinder, by means which: give it 
any position required; so that the image of the burning wick, 
in the hollow of the _—_ _—_— Us ON at CITE on _w 
Spot eee | 3 85 
From his end of the ay axis, on ad same 405 with this 
lamp, projects a small brass arm, carrying at its extremity a 
speculum, whose surface is placed at 45 with the vertical, and 
— opposite the open end of the sector's axis. When 
the image of the burning wick is thrown. from the concave 
reflector on the flat one above, the light passes through the hollow 
axis, illuminating the mother- of- pearl, and is, at last, sent down 
the microscopic tube to the eye below. This contrivance, col- 
lectively taken, is unique, and is full as accurate in its operation 
as ingenious in itself. From its nature, granting perfection of 
work, there can be no parallax between the dot and the wire. The 
images of the illuminated circle and wire, (plumb-line,) are Cor 
incident on the upper surface of the prismatic eye-glass, and 
transmitted so. In short, the whole has been so well managed, 
that the plumb- line can be made to bisect the dot or little cirola, 
as accurately as the points on the divided limb of the sector. 1 
consider this general description of this part of the instrument 
sufficient for the present; the proper plate, and its em 
3 will supply what yet remains to be said. [4 

The plumb-line is suspended above the upper part of the 25 
from a point connected with the extremity of a bert lever, 
.moveable round its f ulcrum. The other end of the lever is acted 
ron by a hel ical spring, which presses downwards, n causes 

Cc 2 


6 of 


= 
5 

> 

4 * 
? R 
k 1 
4 | 


; and has its place in a pipe attached to a mahogany rod, divided 
in the middle by a universal joint. One extrem 
brought down, and received in a zocket within convenient reach 


— _] * = * 1 
* : — P — — 
” ” - 41 . of . 
"32 Of 1 s 

, ” = . 

— , p 

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upper part of the frame. The method of uniting the plates car- ; 
rying those Vs, is as follows: at the upper part of the mahogany 


through the wooden work, and, at the same 
neet very firmly the two sides of the upper part of the frame. 
These cylinders project about six inches beyond the surface © 
the wood, and have screws and nuts at their ends. 


1 on + of the 21 


it to beer nguinst = Screw. passing through a heal of metal be. 
neath that end. The extremity of the long screw is square, 


y of this rod is 


of the observer, who, looking at the image of the dot and wire, 


turns the rod, thus connected w ith the un een 1 deer Do 
ee motion to the plumb-line, © - 


The pivots of theisector's et ant nen 
fectly true and smooth. They rest in Ys, firmly attached to the 


frame are four hollow strong cylinders of brass, which pass 
me, serve to con- 


The brass plates furnished with the Vs, have four holes in 


— which answer to the ends of the screws, and are 


nached to the cylinders furnished with those screws, by the 
respective nuts. In the Ys, the pivots of the axis are placed; 


and, as a means of adjusting each Y is fixed to each plate, any 


position, within a certain limit, _ de 1 to the sector 
ie ig. | 


To prevent aa pivots of the axis Bes- moving to as 170 l in 
a sidelong direction, Mr. Rawspen adopted a contrivance for | 


keeping them, at all times, in the same constant position in the f 
VS. This desideratum was not to be dispensed with; for, if the 


ends of the axis, from the thickening of the oil, or che accumu- 


Intion of dust, should work laterally in their angles, the distance 


- « perplexing 61 bene ths es of great hacer), Tue sum 

| . aner corrsigts Kis0, in one of the V plates eving 
6 of brass Screwed flat upon it, with a roller of 
1eel at its end, which reaches 


poo benen, eceitwtinge of « Nes furtiiched with anoitier | 
| kreten wheel and a — its other erw A | 
and tl We ee e e ue fired ent By 
ese simple but ingenious means, the axis is . retained j in 
its proper situation with respect to the To. 2 N. 
Io prevent the axis from bending, by the preponderance of 
the telescope and arches, Mr. RAMs DEN added braces and cour- 
terpoising weights. The braces are four in number, each being 
a hollow tube: they are fastened both te the axis and the tele. 
en Their principal uses consist in obviating the possibility 
the teleseope bending from accidental pressure, or — 
what n lightly touched. The method ef preventing the tele- 
scope from sinking, or, in other words, the axis from bending, 
is by the use of levers and the abovementioned weights. These 
levers, two in number, are attached to the interior mahogany 
frame at top, the fulcrum of each being immoveable. At 
the end of each lever farthest from the tube, a weight is sus- 


5 _ een wie — eee em Ape Weener 


* 


» Tb / NT 7 - — ——— —— wo 
_ - a Wires $75 * * 1 - a 4 a 9 rr * * ** 2 - " * * bans — * j yh ” r 
” * * * ; 4 d * 
2 $ 
* — 
. - " 4 P * 
a „ * 4 * * * 
x 5 20 - ; . f Tr 8 
% N ” * = 
N , » * 


p F © 
[i A l * 
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b 
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7 * 
6 tr 
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Z Fig 
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i | | 
: 4 
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4 j 
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k 
? 


hollow brass c 
deep, which passes 
external mahogany frame, This cylinder, with its corresponding 
stand, are sustained, without any sort of shake, by. a helical 


the end of the telescope, 


ee no bending takes place i in the ches. tit dert 


From 1 the middle of the two uppermost horizontal cy 1 nder 


- which unite! the sides of the interior frame at top, and which 
receive, with the two beneath them, the respective Y, plates, 


arises a small but substantial apparatus of metal, embracing. a 
linder, of five inches in diameter, and about three 


up into an opening in the upper part of the 


This mode, with that of supporting the azimuth circle 


spring. 


below, are so well managed, that when the instrument is pro- 
perly adjusted for observation, the axis of the sector continues 
| Late horizontal, in every position of the frame. 


There is like wise a very convenient method of i the | 
ectorial tube in any required position for observation. Across 


0 the interior frame, about the height of the graduated arch, run 


two long brass axles, with two wheels on each, one precisely in 


the middle of the axle, (and consequently in the same plane 
with the line vertically cutting the middle of the telescope,) and 


the other close to the pinion at the end of the axle. From a 
steel pin, something peculiar in its construction, situated near 
roceeds a string, which is wound eight 
or ten turns round the pulley. Attached to the inside of the 


interior frame, and just above the wheels nearest to the end of 


ber pulley, over MPH, Passing into a eng and 


| narrow wooden um thrown a N Having a 

and à proper apparatus for receiving the moveable weights. 
The other end of this string is fastened to the pulley close to the 
axle, and gives motion to the telescope, or retains it in equilibrio, 
according to the arrangement of the two sets of weights, which 
consist of fifteen pieces of brass. By these means, all injurious 
pressure is taken off the point of the micrometer-screw, Against 
which the anne be Or Yours with any ede 
degree of force. [ 

Io cause the «ting passing over rite middle of the hey to 
ame in the exact direction of the limb's plane, Mr. RAMsDEN 
placed four small friction-wheels close to the eye end of the 
telescope, two on each side, and between each pair of wheels a 
steel pin, made like a T, with a hook at the end, to receive a 

String. This pin, where it applies to the wheels, is something 
| in shape like a double cone, and is passed behind them. It 

always, from its construction, assumes the same position with 
regard to the friction- wheels; from which circumstance, the 
sustaining string is ever found in the plane passing through the 
centre of the telescope and the middle of the pulley. © 
The micrometer- screw, for measuring minutes and seconds, 
. performs its operations in the usual way: it is moved backwards 
or forwards on a brass arch, parallel to the limb of the sector, 
and placed against the mahogany frame behind. To this arch 
the apparatus carrying the micrometer-screw is clamped; and 
it is adjusted, or brought parallel to the limb, by screws, so that 
the point of the micrometer- screw always bears exactly on * 
same part of the polished steel head, at the end of the sector. 

The principal wires in the focus of the eye-glass are two, 14 
are at ri ight an gles to each other. There are, indeed, two others 


i 
2 
i 
; 
; 
; 
f 
l 


— 


easy. These are illuminated 

nen af — which curries the concave reflector be+ 
en of. There is a hole, with a lens, in the side of the 
telescope, directly opposite to the lamp, having behind it a dia- 
, coated with plaister of Paris, and inclined to 


— 
6 


quantity of li ght, Suited to the circu mstances of the observation, 
is es 80 coloured glasses, placed over the hole in the side 


„ % - 
1 1 a ” : x 1 10 > : - 2 * 
. * . . 7 * d 
< 7 ISS. 


Spend bat the wire, falls into eee mee 
cup, swinging by two pins on its e 
brass frame annexed to the interior otatid; kts Te 


pable of being raized or lowered at pleasure by a — | 


screw; so that the wire can, at wi O04 omen ex from the 
weight of the plummet; by screwing up the vessel contai 
There are two arches attached to the alu of the-tube, one on: 
each side of it, and united together by means of brass 
Pillars; which arrangement effectually secures the divided arch 
from injury. The total extent of the arch is about 155 having 
half of its subtense on each-side zero. It is divided into ex 
minutes; the micrometer-screw measuring any sup 
quantity. Golden pins were let into the arch, by the advice of 
nom er cee on which the divisions were laid off by 


0 * 
\ 
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o 
* 
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< 
. 
' . - 
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— n * 
x 0 = 
* 2 5 5 
* - 1 * 
1 
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— = 
* 
8 7 » — 
* * Cd 
* 
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x 
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* 
DJ 
* 4 — 3 5 — 
. * * I 
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— 
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* 0 * 1 
7 7 
9 — 5 * 
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n — 7 71 
* J 0 1 * p b 


8 — 2 


2.4 


4 | 1 
3 


_ 3 is, one of the four great upri 


* 


A 2 N 


d convenient; ; but habit and 
astronomer to use 3 of the other 


1 e pink its various 


* 


* ö % ® a bn 


1 Particular Description of t the 


* 


* 


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ii £% 2 , 


ts a gen 


1 


ö ij 
* 5 


section of the instrument and 


. 
„ 


hts of the e external 
frame, and CB its top, having an opening ii in D, for. 
admission of light. The uprights consist of two strong pi 


ee e, ther 3. each upright having seven strong 


bo 
wy 
Se 


4..% 
- 
* 


SCFews, as seen in the upright AB. The top may be considered 
as a sort of square table, screwed down on the, upper part of the 
kts is a brace, diagonally y 
lor strengthening the stand, as may be seen in the plate; 
and four others go horizontally, from upright to upright, for 
the purpose of still farther strengthening the whole. Across 
the bottom of the frame, and exactly in the middle of it, is a 
very strong mahogany plank, whergon : rests the sector, havin ga 
stout straight edge bar of the same substance underneath. In the 
midd e of this cross piece, as seen at E, is an ap aratus of brass, 
furn ished with an azimuth circle, having a hollow receptacle of 
bell-metal i in the-centre, in which rests, on a oonieal point, the 
interior mahogany frame FGIHII. This brass Work, Which is 
and substantial, may be seen in Plate XIV. It is there 
in plano, with the bottom part « of the interior stand 


frame, Between each of the two upri 
fl 


% 


; k ? on 
- # . 5 


A r eee, . — * 
A 


* 


- 


- 


* ” 
= ; * - - 
n 4 *. 
* * 
+ % % 4 2 Fay 4 — * 8 1 
0 a 


CPE 


tical, are found in the work — to hs azimuth * | 
They consist of two screws, attached to two plates of brass. 
placed at right angles to, and also flat on each other. 8. (Plats 8 
XIV.) are the screws. A vernier on the divided circle may be 
een at S; and at's, the method of clamping the bottom of the 
stand. On the opposite side is another provision for” clanping 
= this stand, when the face ol the sector is cha Agec e east to 
west, or vice versd. . 5 
KLMNOꝰ (Plate X. ) 1 is a ection 's TV! bas and axis, 
| MR, MR, being two of the four braces for strengthening the | 
axis, and steadying the telescope. K is the place of the eye- 
tube; L the elliptical reflector for illuminating the wires at K; 
and ON a hollow cylinder of brass, independent of the tube. In 
the upper part of this cylinder, the object-glass is rivetted; the 
cylinder itself i to the dah ne in a GE 
nent manner. + ; 
W, W, are two weights, oY holy bent the ends of two 
levers, the opposite ends being furnished with four friction- 
wheels. The points of Support, between the weights and wheels, 
are at TT, being at the extremities of two upright solid pieces . 
of metal, which are moved up or down by the screws beneath 
them. These counterpoising weights prevent any bending of the 
axis, between the pivots and those parts to which they apply. 
The apparatus far carrying the levers, is attached to the inside 
mahogany frame by SCTEWS, | as Pas in the section. See 
also Plate XIII. 1 IT [i „ 
The plummet and ald 6 are seen at a OY the point of N 
suspension being a, and the plummet 4; the plumb- line passing 
close by the arch, whoss Section is bc, and also near to the dot 


wits 


en an Arc of the Meridian. "Tg 


is croton eee 3 


nexed to the side of the interior frame, and may be seen at XZ. 


At the back of the lamp, placed in a recess, is a ooncave reflector 


at Z; and, e SEL WK 


double convex glass at P, for.throwi ng the light on L, which 
first passes through a double concave glass in the side of the 
telescope, and then, from the reflector L, is thrown down on the 
wires near K. The concave speculum Z, has two adjustments for 
ö converging the reflected light on the little elliptical speculum b. 
This last- mentioned speculum throws off the said light at b, 
which passes into the axis at G, illuminating the mother-of-pearl 
| at's and, finally, i is transmitted out of the axis at p. 
. klmn, is a section of the long microscope, for conveying the 
image of the dot and wire, sent out of the axis at p, to the eye at 
þ. This microscope is firmly attached to the side of the 8 
5 by brass wi i" kk, Il, mm, n, and has one plano=convex 
glass at 9. prismatic eye-glass at u, and a metallie reflector at 
the top, o. At the upper end of this long microscope, and 
directly behind the speculum, i is a screw, by which the reflecting 
metal is brought into one of its requisite positions. The other 
- adjustment of that metal. is performed by two screws, which 
apply to the sides, and give it lateral motion. The plano-conyex 
glass at q, is rivetted into the head of a long tube 19, which Slices 
up the microscope. The upper. part of the microscope at o, is 


placed exactly opposite the end of the axis, in a very firm way. : 


The rod for giving motion to the plumb- line, is ,vwz; » 
being the top of it, w the place of the universal joint, which 
enn ee parts of the rod, and æ nn. 

D 2 


10 
An circle e, Gesteibed on ihe thin alice of mother 
| pearl, shown/in the section of the axis at e.. Set of 2 407 


Py 


| top vis not furnished with the pipe eoxinecting it; witti the hent 5 


cConstituting the di 


undt 60 e me heel erde Ain de action; bs 


| lever above; hut dhe represantation ai it-togather:with-the lever 
itself, and accompanying spring. will be understood by referring 
to the plate hi aontains a nepresevtation. of those part A 
In Plate XII. is A section of the axis passing through the 
1 ls and one exhibiting the face of the several united planes 
wagm, Wbieh adjust, in every. direction, 
the slice of mother- -of-pearl./. Above this latter, is a vie of the 
lever which gives motion to the plumb - line, with the. pipe, 
Spring, Ge,; these are represented as seen ſrom an eye at one 
_ of the pivots; and, above the other section, is a view of the same 
nee in a direction at right angles to the ſormer one. 
In the latter of the above-mentioned. sectians, bab. is 5 | 
diaphragm, having in the middle, as at p, a circular piace of 
mother- of- pearl, extremely thin, with a small dot in the centre. 
This brass work is annexed to the large end of a hollow conical 
piece of brass, which exactly fits the axis at its proper place. 
It is there screwed fast, and may be considered as of one piece 
5 with the axis. In the adjoining figure, hf+1, is a section of the 
cone, p being the place in the opening of the brass work which 
receives the mother- of- pearl. In the representation of the dia- 
phragm, a and b are two screws, at right angles to each other, = 
and respectively attached to flat pieces of metal which slide . 
on each other. If Fb represent the plumb- line, the direction ol 
each screw is that of an angle of 45 degrees with it. By means 
of these adjusting screws, the dot or little cirele at þ was placed 
in its proper position, or in the centre of the circle ebb; so that, 
on an adjustment of the plumb-line, i in any one position of the 
amen the dot still remains . bisected, . 


* 


SE "IS 


be ently moved. anne abb, is in a amall 
frame-work of whe from which the plumb-line depends: it i: 
attached to two of the ſour horizontal tubes on which the * 
frames ate ſustengd. cd is the pipe fastened to the end of the 
rod: the end of This pipe has a screw, which passes through a 
nutz · and acts against the end of the lever d, hose centre o 
motion is g, and whese other extremity is f, here there is a 
small pieoe of hard stéel with a notch, for the reception of the 
lumb-line 16 een from . _— the Rue ee 


| sten 5 e te end of os dar at e; by Which means, 0 
arm gd is co stantly pressed against the end of the pipe, ob- 
_ at P een fi Vol "gy . or A the FR; IEG 
The same e contains an erin of the hank just 
| described, as seen by an eye in the plane of the diaphragm pro- | 
duced. It is necessary that it should be closely inspette ,-for 
the unn of obtaining an adequate idea of its construction. 
In cus figure, xv is a small cylinder, with à screw and loose 5 
collar at the end v, for fastening the plumb-line, which goes 
over the notch n, and passes through a hole in the upper part 
of the axis at f, and out again at b, almost touching the mother 
of- pearl at p. sru is a strong spring, fixed at s, through the 
middle of which, at 7, passes a screw, which is, in fact, an ad- 
justing screw, for bringing the plumb-line close to the dot on 
the surface of the diaphragm; ; and here it is necessary to ob- 


serve, that tlie plane of the divided arch and that of this diaq- 


phragm, are one and the same when produced. There is no 
part of the instrument more complete than the apparatus for 
| Ry the plumb-line, and I that which 2 the dot. I 


22 e An Account of the Meazurement 


shall now return to «farther consideration. ee cons . ction 
; of the axis. Kc 
Inn Plate XII. thinks is Fs a W view of Si aid a 
: Ae A being the head of the microscope, and B the little 
diagonal speculum, for throwing the light on the diaphragm. C 
is the opening in the axis above the object-glass; and D a brass 
slider, for covering the opening at C. E and F are two pulleys, 
attached to the side of the axis, over which pass two strings, 
having their ends united in opposite points of the shutter D; 
the other two ends of the string being within reach of the ob- 
derer. who by this means easily opens or shuts the slider. 
In Plate XIV. ABCD is the moveable frame, fastened to the 
top of the external stand, and having an octagonal opening at E,. 
for receiving the brass work connected with the four horizontal 
pipes carrying the Ys. The touching points between the octa- 
gon and cylinder, are g, b, u, at which parts of the frame hard 
pieces of metal are inserted. To prevent all possibility of shake 
in the cylinder, which would render an adjustment of the 
instrument troublesome, if not impossible, there are two strong 
screws at m and u. One is a helix, which acts against m, and 
against the end of the sliding piece n; so that, by a condensa- 
tion of the helix by the screw m, the piece n acts n the f 
head of the cylinder inserted in E. 
Plate XI. represents an elevation of the instrument seen ods 
ways, and is that part to which the long microscope is attached: 
it serves fo show the formation of the interior stand carrying 
the sectorial tube. ABCDEF are mahogany uprights, firmly 
united at the bottom and sides by proper cross pieces, and at top 
by the plate of metal a be d, through the ends of which pass 
—— of four horizontal | pipes, the Plats ab cd being one which 


„5 \ fan 26 of the Merlin, 


2 
carries a v, Madden in this lion bythe v _ r pare of th 
od of the microscope. = 


in the middle of the cross biens 140 unite 4 Side oY 


Sionks to its corresponding one, are two wheels with long axles, 
as before mentioned. In this elevation they are seen at B and E; 


and have strings n from them to their respective sides of 


the tube, where they attach to the pins P, P. At the ends of the 
axles nearest to this elevated side are two other pulleys. In the 


view which this plate affords, these wheels are projected against 
the others just spoken of; but their uses will be more readily 


understood, on perceiving the strings which pass over the upper 
pulleys, and afterwards sustain the nen W. has: in andy "ye 
right cases. 


In this e is seen n the re a. 10 the aide af 
che great tube: it is used when the instrument is got into the 
plane of the meridian. The vessel for receiving the plummet is 
seen at V; and at 8 the adjusting · screw, for elevating or depressing 
the frame which supports it. LL is the clamp- arch, supposed 


to be attached to the other side of the tube, or that which sup- 


ports the lamp. At the bottom of the stand is seen n the _ 


ob and the apparatus belonging to it. - 


For the purpose of conveying a clear idea of the args 
ment of the lower pulleys, and the manner in which the two 
arches are joined to each other at the end of the telescope, there 


is given, in Plate XII. a horizontal view of the same. The vessel 
for receiving the plummet, its supporting frame, and the magnifier 


for viewing the dots or .points on the di vided limb, are likewise 


represented. The body of the: telescope is here taken away, 


leaving nothing more than the plate at its end, with the conti- 


- guous work — to the wires. 


v + ab TT a ab — — — — — e 


manner in which the cross wires are n the tube, also M0 
the means by which they are adjusted, figures are given! in 
Plate XII. These also show the mierometer- screw, and the 
mode of clamping it to the proper won a ber the horizontal re- 
presentation of the end of the telescope, 
the centre, and also the two screws, Aae \ helical epeilg for 
n and retaining them. EF is a strorig brass arch, with 
an edge bar IK, placed parallel to the divided arch. At EF are 
seen two milled-headed screus, passing through a metallic 5 
embracement of the bar and arch, which are firmly. connected 
_ with the apparatus belonging to the micrometer by their means. 
At S is a piece of hard polished steel, against which the point 
of the micrometer- screw rests; and, as the arch EF is the seg- 
ment of a circle whose radius is its distance from the axis of | 
the sector, the point of that screw always buts against the steel 
head in the same place; In this plate is also seen a vertieal 
section of the same parts Here, EF is the back arch, and MS 
the micrometer-screw.. This figure also Shows the means by 
which the pieces carrying the wires, and inserted into the end 
of the telescope, are retained in their proper places. CA and 5 
DB are two long. pillars, which pass throu "ey an annular e 
> brass parallel to the end of the tube. 
A screw with a windlas-like head wa seen at 0 Nevin the N 
— of which, the wires are moved in one of their proper 
directions. A screw for giving them a motion at right angles 
to that obtained by the fore- mentioned one at G, is seen in the 
horizontal view of the end of the telescope at H. 41099 


It would be swelling this account to an imoomnlend. die vide 
1 were to attempt any farther explanation of the plates ; I hall, 


A 2 + e . > * - J 
> 2 a : 99 / . A 
. ˙ ww Mu... 2 . 8 \ — — I ones... , — 
ö r c i ns ee abt N "4; m# r 
* Py * ” 
F 8 


2 fl 
_ % 
+. 4% 
4 
+ A 
, 5 
: + ** Spc 
* - 


ef n dev ofthe Meriden, 25 


therefore, close this article witha fow observations 0 0 manner 
of Wen the instrument for obge: 7 


Manner of ajurting the 1 far Obgervation. 


The feet of the external stand should be first carefully WI 85 
into a horizontal plane; and, when they are so, the azimuth 
Circle will be, necessarily, parallel to it, having its centre under 
the middle of the opening in the mahogany frame screwed on 
the top of the stand. This being done, and the instrument set 
up, the plane of the arch should be brought parallel to one of 
the sides of the stand, i in which situation, the internal frame is 
to be clamped to the azimuth circle, and the wire brought to its 
proper distance from the limb, by means of the adjusting screw ; 
attached to one of the sliders, which carries the concave recep- 
tacle and conical point. The dot at zero should then be brought 
exactly under the plumb-line, as seen through the magnifier, 


and the point on the micrometer-head, at which its index stands, 


noted. The-instrument is then to be turned half round; and, if 
the same dot on the arch still continues bisected, it will afford a 
proof of the internal stand being upright in one direction. But, 
if the dot should not continue bisected by the plumb-line, it 
must be made to do 80, and the revolutions, or parts of a revo- 
lution, counted; half of which is to be turned back on the micro- 
meter-head. The same dot, zero, is then to be brought under 
the wire, (plumb- line,) by means of the other adjusting-screw 
beneath the azimuth circle. If the stand is pretty accurately set 

up, one operation is sufficient for bringing the interior frame 
upright in one direction, viz. either in that of the meridian, or 
the one at right angles to it. The arch is then to be turned 


* 


wounds go, and che dame + openition gone hoiſts This ra | 
properly done, the interior frame is made perfectly. upright. - 

The next Step to be taken, is that of placing the Jong level 
on its axis above, and rectifying that axis by means of the Y 
plate screws. If this be done carefully, the bubble will remain 


between the pointers of the level, whatever position the sector 
may be placed in. Having thus rectified the instrument, by 
making the internal frame upright, and the axis horizontal, the 


only remaining point to engage attention is, placing the plumb- 


line at a proper distance from the arch: this is done by means 


of the screw acting on the spring just under its point of suspen- 
sion. If great care be used in going through these several 


adjustments, the instrument may, at any future time, be accu- 


rately adjusted for observation, by turning the proper screw 


belonging to the azimuth circle, and dee the arch to its 


cht distance from the wire. HP 


taping off FO Oe viding the Limb of the Sector. 
The first step preparatory to finding the length of the radius, 
was to mount the Sector in its frame, and adjust the counter- 


poising weights. By attention to the proper points on the levers, 


the axis was kept from bending, the pivots not having more 
than a weight of two pounds to support. This done, a tool with 
a well defined point 125 made to press lightly against the face 
of the arch, and firmly sustained in that situation, while the 
gectorial tube was slowly moved to the right and left: a fine 
line was by this means described on the limb, passing through 


the centres of the golden pins. The arch having been thus 
struck, the telescope was taken out of its frame, and laid on the 


—— of the Miridian. 27 | 


vote eee having les erte hovievatal; and the 
pivots resting in Ys firmly fastened in the middle. The end of 
the arch, whose face became vertical, was supported by a brass 
plate screwed down on the end of the plank. When the pivots 
were placed in the Ys, and the telescope sustained in several 
places, to keep it from bending, a brass slider, on the surface : 
of the plank, was moved till the line before mentioned coin- 
cided with that described on the arch. The telescope. was then 
quickly taken out of the Ys, and, as speedily as possible, brought 
into a similar position on the other side; for which purpose, 
| braces to support the tube had been previously prepared. By 
these means, twice the length of the radius was obtained; 
proper care having been taken to have the Vs 80 placed, that 
the centre of the pivots should be in the same plane with the two 
sliders at the extremities of the Jos The distance between 
the lines was then measured, and u taken for the chord of 
75 10/, which was w e ths laid off on the face of the sector, 
on both sides zero. | 
Although little doubt could be pride of the ruth of the 
total arc thus assumed, yet, that the length of its chord might be 
compared with that derived from the usual modes of operation, 
Mr. BERGE (as proposed by Mr. RaMsDEN) prepared a brass 
arch, which he let into a frame, on which, after striking a por- 


tion of a circle with the radius obtained as above, he laid off the 


chord of 609. This arch he divided by. continual bisection, till he 
obtained the chord of 7 10', which he compared with the same 
angle laid off on the sector's limb. He had the satisfaction of 
finding no perceivable difference; and, that there really existed 
none, was denoted by the unresisted fall of the points into 

their respective holes. The arch of the sector was then divided 
E 2 


C 8 An Account of the Neauuenent 


5 into degrees, and every degree into five minutes; and dhe holes og 
were afterwards opened with a tool made for the purpose. As gold 
pins had been let into the arch, Mr. BRE was enabled to go 
through the division of it with great success, and afterwards to 
enlarge the holes, without destroying his accurate work. The 
observations will offer a more satisfactory testimony of the credit 
due to his abilities as a workman, than any opinion which 1 
might express myself as entertaining, although founded on 
the same data. It remains for me only to observe, that I think 
he has delivered this instrument into my hands without any 
' imperfection of execution; and that I believe it would not have 
been superior, had the 3 inventor lived to complete it. 


Adjustment of the 8 pry borixental Wires. ors 


After the arch was divided, the axis of the telescope was laid 
on a pair of Ys connected to a firm support, and made nearly 
horizontal. The tube was then brought up to a level with the 
axis, and sustained at proper intervals, whilst the end of the 
telescope rested on a small piece of metal connected to a fixed 
bar, by means of an adjusting-screw. This end was then moved, 
till an object sufficiently small, (a speck or dot,) at a proper 
distance, appeared. nearly in. the centre of the field. The tele- 
scope was then properly secured from bending, and rendered 
perfectly steady, but admitting of a small motion Sideways, | the | 
* Ys having also a corresponding adjustment. 1 e 
A microscope, furnished with a moveable wire, was then 
fantened to a beam attached to the brick wall, and its end 
brought elose to the edge of the arch of the telescope. Upon 
this edge, as well as on that of the other arch, Mr. BerGE had 
the address to lay off a point, very nearly in that place where the 


9 ire of the Meridin, e 
me passing through the axis and zero cuts the arches. This | 
being done, the telescope and Ys were moved laterally, till the 
vertical wire bisected the speck. The system of wires was then 
turned, till the meridional one was made exactly perpendicular 
to the axis, as seen from the mark being bisected in every part 
of the wire, when the end of the telescope was moved up and 
down by the adjusting-screw. The axis was then carefully 
taken out of the Vs, and inverted: it was afterwards placed as 
before, and the distance between the spot and vertical wire esti- 
mated by the eye. The telescope was then moved in azimuth, 
half that quantity, and the meridional wire brought to a bisec- 
tion on the speck. Repeating this operation twice or thrice, the 
vertical wire became accurately perpendicular to the line passing 
through the centre of the conical axis, and also in the plane 
panning through the centre of the tube. 

The next step was, to move the whole system of wires in the 
direction of the perpendicular, in order that the horizontal one 
(at right angles to the vertical wire by construction) should be 
also brought into its proper position. For this purpose, the tele- 
scope was moved a little in azimuth, and the proper wire made 
to bisect it accurately, at which time, the wire of the micrometer 
before mentioned was brou cht over as fot: on the edge of the 
limb. 

In this position of things, the enen 4 was ken off hs 
Ys, and turned over; it was then again carefully placed in its 
former position, and the end of the telescope brought up by the 
adjusting-screw, till the distant speck was bisected by the hori- 
zontal wire. Now, if this horizontal wire had been, by accident, 
placed so that the point of intersection of the two wires was 


2% An Achaunt of the Meaurement 
exactly in the true centre of the telescope, the dot on the edge 
of the other limb would have been bisected by the wire of the 

anterior microscope. This was found not to be the case; but it 

was made to be so, by halving the differences, and moving the 
horizontal wire so as to bisect the mark. After this had been 
again examined, the vertical wire was n when it was 
ſound necessary to go through a part of the. operation a second 
time. This was to be expected; but the wires were, by these 
means, at last properly placed, and guards were then fixed over 
their adjusting-screws. I shall now proceed to apeak of the use 
I made os this sector in the ann 1803. 


Rruaded exlading 145 — Tear 182. 
1 have already stated, that a proper observatory had been 

provided for the reception of the zenith sector. The dimensions 
of it were twelve feet square at bottom, and six ſeet square at 
top; its proportions being the same as those of the external 
stand. A floor having a square vacuity, to admit of the instru- 
ment standing on the ground, covered the joists of i it. The sides 
of the observatory were of strong painted canvas; and the roof 
of wood, with an aperture, which could be opened or closed at 
pleasure, for viewing the stars near the zenith. 
The instrument, with this observatory, was erected in the 
Tower on the gd of April, merely to examine all its parts, and 
to ascertain whether any thing could be done to render it more 
perfect. Some trifling addenda were accordingly made, and 
te whole, thus rendered perfect, was removed to the Royal 5 
Observatory, and erected in the garden of the Astronomer 
Royal, close to the eastern extremity « of the transit room. 


\ 


gf arr of tht Merit, 5 34 


I am now to gpecify, that my intentions were to devote, from 
tile period, the whole or the greatest part of the following | 
summer, to the use of this sector; nor did I indeed imagine 

such a portion of time more than sufficient. I purposed to erect 
it at Dunnose, and at Clifton, the extremities of my arc; and 
also at Arbury Hill, near Daventry, the station almost in the 
middle of it. This last station 1 fixed upon, because it was 
proper to ascertain how far the observations for determining 


1 the extent of the whole arc, would agree with any others made 


ſor finding the value of its parts. The erecting of it at Green- 
wich was necessary, for the purpose of observing the zenith 
distances of certain stars, which were aſterwards to be observed 
at Dunnose, thereby affording means of agcortairiing the lati- 
tude of that station. ; Hf 
The instrument remained at the Royal Observatory till the 
26th of April; and, although the weather was for most part of the 
time unfavourable, yet the erecting of it there will be found, as 
appears in a future part of this work, to have answered the pro- 
posed end. One very material service accrued to myself; this 
was, the advice and instruction I received from the Astronomer 
Royal, for the successful management of the sector, by which I 
scrupulously governed myself throughout the whole of the sub- 
sequent campaign. Having observed the zenith distances of 
some few stars, and made myself completely master of every 
adjustment about the instrument, the sector, with all its appa- 
ratus, was sent to the Isle of Wight, by way of Southampton; = 
every possible care being used to protect it from injury, not only 
While transporting by land, but also when under the act of 
being taken into, and removed out of, the vessel which conveyed 


g2 An Account of the ——— 


E from that place to Cowes. It will be readily aupposed, that 
watchfulness and care were necessary, to preserve this compli- 
cated instrument from we pte = en or eas ; 
of the roads. jog 
In the year 1794, an iron carinon was _—_— in the ground, : : 
for the purpose of permanently preserving the point on Dunnose, 
where the direction of the meridian was observed in 179g. It 
must be now remarked, that the cannon so inserted could not 
have its breech placed so low as might have been wished; in 
consequence of which, it became necessary to erect the obser- 
vatory for the reception of the sector some little distance south- 
ward of the old station. The distance from the centre of the 
gun to the point over which the instrument Was afterwards | 
erected, was six feet and a half. - 

To procure for the external stand, and the ence for the w hole 
apparatus, a firm foundation, I caused four long stakes to be 
driven into the ground, one for each foot of the stand, to which 
its feet were firmly screwed down. The surfaces of the stakes 
were then cut off smooth, and brought into the same horizontal 
plane, by which means, the interior frame and sector were placed 
much within the limits of their several adjustments. 

The pointed top of Sir RichARD WonsLEx's obelisk afforded 
me an excellent means for bringing, with the assistance of the 8 
side telescope and azimuth circle, the plane of the arch into the 
true meridian. The distance and magnitude of that object 
is extremely convenient for the purpose. Its bearing from the 
meridian of the station is 87 42“ gg", as I shall show in its 
proper place. The side telescope was turned to this object very 
frequently; and I never found the vernier, on the azimuth circle, 


| 1 N 2 | 


to indicate any serious Warp in che stand. Its greatest y | 
Was dat for Several. ns it did ot umount. 
go". 1% 528 tn Tt ens; gOfager viigt batdiob I de diet 0 
Ni The voight of the plummet, I e nw rengtl ol the 
umb-line, in the usual way. Tespe it i ir an gra- 
- dually increased its weight, till the wire broke. This plummet 
was ank nersed in the vessel appropriated 5 its reception. 
0 will, perhaps, nbt be improper to observe, that I was careful | 
N 8 the plummet its maximum of weight, that its wire m_ 
| not be subject to motion from streams of air. y 
Ass it was to be apprehended that errors 3 esult, a 
the effects of an inequality of temperature in the air within the 
Observatory, I placed two thermometers, both adjusted to a 
third, near the telegeope. One elevated as high as the axis, the 
other 4 laid on the hollow brass eylinders which connect: the 
divided arch. with that behind it, usually called: the dal anch. 
In the day, 1:found (as may be seen in the register of observa- 
tions) the heat a little greater at the top of the tent than towards 
the bottom; and the reverse was generally the case at night.. 
To equalize the temperature at those times when the sun 
shone out, or the weather was hot; L opened the shutters in the 
roof, as well as the door of the observatory, a considerable time 
| ment of observation. By these means, the air 
within Wwe gent vas rendered wolerably uniform in its 714g 
heat. For the space of a week following the commencement 
of my obseryations, I suspended a third thermometer from the 
2 Ws | [ed-headed key which turns the diaphragm placed inside 
me retagcope Ns tfie situation of this thermonieter was midway 
between the two others just mentioned, I always found the 
ture there, — 
F 


— 


ermometers ; and an; i he course 
dme ed had various opportu ities of e — 4 
on this point, I desisted from making any farther use of it. For 
the purpose of ascertaining the limits of the errors Nkely to result 
from the cause now spoken of, it will be wude institute some 
| Ittle inquiry into its mode of operation. i be snd 

In Plate XVI. Fig. 1, let CD be the line paniing aeg the 
cehtre of the sectorial de, brought into any position for obger- | 
tion; the angle made with the zenith being 'ACB, and CA he 
consequent direction of the ee 'CB os d BA uy ther r 
fore represent the radius and arch 
state of uniform temperat | 

Now, at any time, let the — 4 at 2 top C, indicate 
a degree of heat superior to that shewn by the other at B; and 
let it also be supposed, that che difference between those degrees 
of heat, at any intermediate point, is directly as the distance of 
that point from Cor B; and farther, let the tube CB be extended 
to D, while the arch AB continues of the same length. 
1 dae extended to F, and the line AE en 

parallel to BD, meeting the arch FD in E, then will the small 
2 FE measure wah error in pays n N * of 

* — SE Ach n must in 00 cases TH amall//ACB ad Er 


may be considered as two similar sectors of circles; under 


supposition, we get FE = = - and, applying this to an 1 2. 


1 


treme case occurring at Arbury Hill, on the 30 of e 
5 251 ann 
$*x0,0001257 inches KC 9 
e e 7077 7 omar ö 


— * . 1 t ; 7 "A oy * 1. 
5 ö E 2 R . 64 >, 4 * * * os "£5 5 + 
== 0,596. &G 54 if 16; | Hotte 1111771 Ty ; l. . 3 1141.0 3 i, F 5171 ry 99% 4 2, 
* : 


— 


. 1211 i 53 | 


, % 


As few of the strs leere for observ: 


1 ? 


* "Ig ; 8 27 3 *. * 
: 


bak 295, a FI and this ee will-reodve. e sup- 
ort, from the actually near approach of the two temperatures 
to an equality with each other, as appears by tz taking the mean 
results of the last two coli ms in the register ene 
That the scrupulous ny a be satisfied ir lar, 
I. shall insert, in its proper place, a table for 3 ths 
correction arising fi from this cause; as the effect of a greater 
heat in the upper part of the tent is an error in excess, 80 a 
everse of the case produces one in deſedt. 
On the first convenient opportunity, I . Sth 
© e the distances between every successive set of dots on the 
Grided ach, tee been zero and 95 10˙. This was done 1 
in the ere the my within = Pg * from 
the calmness of the day, no streams of air could affect the 
plumb-line. Although I had, previously to the performance of 
emitted from the lamp illuminating the face of the arch, do not 
expand it perceivably, yet I thought it best to wait for a day 
when the strength of the light should enable me to discover, 
roperly; bigect, the points, without the aid of that lamp: 
n zero ah 7 10%, on the left hand arch, I found there 
were 480 ere of the micrometer-screw + 38, 2 divisions; 
and, between the same bee 7 10˙ n the _ hand, 490 
revolutions ＋ 9.2 divisions. | 20 
From this it appears, that has mean 1 of « one nk of 
the screw, is o' 39“, ogg. Mr. BRE endeavoured to place the arch, 
carrying the n of the micrometer, o that one revolution 
. * 2 | 


of the 80 
nearly a second short; for which res 
into 59 parts, and called each of them a second. '1/think/it 


contained between 17 and ig on the index, arising from a small 


m will be found in revolutions and parts of the screw. 


ciently numerous, and apparently sufficiently accurate, f 


to see it in the observatory, without ro 


Ro. 4n eons of he Meennement 


Should be exactly a minute. On trial, he ſbund it 
eason, he divided the head 


, that the wo arches. were 
zured v it admits of the pemark, 
8 subtending g“ was me asured with | the ame hart 


of the screw, beginning very neariy from gon the inden! This 


instrument will, at a future period, probably pass into other 


hands; it may therefore be right to state, that i found; from an 


examination of the screw, an error of nearly 1 in the part 


notch which, with a magnifier, I could plainly perceive on one 
of the threads. As it cannot but be the general wish to have 
some evidence of the accuracy with which! this sector has bee 
divided, and also how far I have'succeeded in the nee 
of what is now under consideration, a table will be given, in 

which the value of every 5, in the first degree or each 6 


Having towards the end of June found my 


i } the 
regular differences subsisting amongst them, I took down the 
sector, and, with every thing belonging to it, repaired to Clifton, 
the northern extremity of my arch. The instrument arrived 


there in safety, on the 0th of July; and, as the direction of the 
| m_ had, Aden ae nnn W nec was 


At this ation: Ladies Spire afforded" ee eee mark 


| for adjusting the instrument in the plane of the meridian. The 


bearing of it is 1* 36 12" south-west ; | and; from my being able 
ng up either of its 5 


4 * . © 
I ; OY — 


e of the | 


vas sides, 1 had ready means, at all "tis, tin not 
pe to > that object.” And 1-can take upon me to bay, that 


Whole of my stay at this station, 1 never found: the 


——— out of the plane of the meridian more than ralf a 
| minute. IN ge 
0 the. 27 stars obbitved at üble, 17 were on at 
his station; they were the following, viz. G, 5, 45, 46c, 51, 
16, h, Draconis; 14, 10, cygni; % E, Urse; "227, B55, 5%, , 
Herculis; = Persei, and Capella. | 
As the weather for most part of the time beben favourable, 
che observations were completed on the asd of July; and, as 
there appeared to be sufficient time, between that period and the 
arrival of the season which would necessarily terminate my 
operations, to carry on my. meridional line to the Tees mouth, [ 
reconnoitered the country in that e and onjochen top. sta- 
tions all the way between it and Clifton. 
On the 23d of July, the instrument Ad ole. were 
taken down, and the large theodolite erected over the point. 
White lights were sent to the distant stations, and were all 
observed, except those fired on the goth day of the same month: 
and, as the night on which those lights were burnt was remark- 
ably clear, and it was therefore probable that some intervening 
land obscured the distant hill, I desisted from making any | 
firther attempt towards the execution of the above scheme, as 
any greater loss of time might prevent me from making the pro- 
posed observations on Arbury Hill. I therefore sent the sector 
to this last- mentioned place, where it arrived on the 3d of 
September, and was erected on the 7th, the direction of the 
meridian having been previous] y ascertained, by two double 
| azimuths of the pole star. But it is proper I should observe 


the: soil, owing to 3 cultivated pap, up spot on which 
rth #09 5 towards the wer, ol the 


former station. 5 8 Der 
Of the stars Seen at. Clif ton, 12 were obgerved, : at T 
Hill, These observations. were continued, with. very little inter- . 
| ruption, till the 4th of October, when the party, with all the 
apparatus, returned to London; the zenith sector being found 
as perfect on its return as when first sent into the field, a cir- 
ee . both the eee and perfor union of, its 


x 
a a 
5 > : * > 2 *: 8 "= 
* 4 * 5 1 \ ; A „ IP RY ey OF 7 3 
* oy 


Porticu lars relating to the Measurement of a; a new „ Buse Line, on 
">  Misterton Carr, in the Year 1801. yo 


"The ee used for the measurement of this ee Was | 
the same as that employed on Hounslow Heath, Salisbur. Plain, 
and, Sedgemoor ; and the like pains were taken to ensure its 
accuracy, as were used on those occasions. The points for lining 
| out the base were put into the ground with great truth and pre- 
Cron; the large theodolite being used as one of the means, and 

in the same way as in measuring the base on Salisbury plain. 
Previous to the commencement of this operation, two large 
blocks of oak, with square holes on their upper surfaces, were 
5 sunk. in the ground, at the extremities of the base; the paint of 
intersection of the diagonals of each hole, severally denoting 

them. These diagonals were drawn on lead, cast into the holes, 
and ground to a Smooth plane, even. with thn, ourſace 9h the 
block. 


Belore the n measurement began, the wenns chain A, and. the 


%. 


ef an Ae of the Meridian | 


: 


36-fte ichaini, Were boch compared with the stundard B. För 
this purpose; à calm cloudy day was waited for, which' opOr- 
unity bern ved itself — the'sd of Jane. The 3 for the 


depth, a the bord aw a right” ive between 


chain A was then laid out perfectly straight; ate five war mo- 
meters, equally distant from each other, 52 2 clobe to its 


; 7 

4 | FR 7c i hs * * # Sg 

x n der bacpefanes 1 as follows: A baba 
1 * #8 * ; 4 | 4 1 4 F - p 
32 111 4 111 . T 19 7116 * in . 2 71K 1 * * in, 

V - Thermometers. Sets 
1 "i 1 ; 1 Fils 1171 3 II 8 13 Z 

13 | | 1 

D xt Fi Ale; — — — 3 95 — vg © * 3. i 
NN "27 

mee cb 40887 5; 67 67 ere org mew 


The chain A was 5 taken out of the coffers, and B laid 
out in its stead. The difference of their lengths, which Was mea 
sured with the | micrometer-screw, wWas found to be 1 revolution 
6 divisions; viz. A longer than B; the temperature remaining R 
constant the whole time of trial. In the <ourse of the day, the 
same operation was repeated, the five thermometers standing at 
695,569 69,569.69 hen Bwas found tobe 1 revolution 
61 divisions of the mierometer- head shorter than A. Therefore, 
the mean, bix. 1 revolution 64 divisions, was considered as the a 

true difference of their lengths. The length of twiee che go-feet 
chain was, at this trial, found to exceed that of B, g revolutions 
4925 divisions ; which i is nearly the same determination as formerly 85 
resulted, from a comparison of the chains with each other n 
Sedgemoor. It may be 8gen too, by referring to the account of 
the measurement of the base on that spot, that the difference: 
between the lengths of the standard B and common chain 
A was nearly the same at that period as now; the difference 
being 1 revolution - divisions. I therefore concluded I might, 


* 


—_ — — — re One TIS ae oe 3 — 2 
— 


. 


An Aae of 65 Meuurement 


with ate y, suppose ihe length, of the, standand chain Bt be. 
exactly the same then, as at the period when, Mr. Ru 


: 


compared it with the points inserted into the east da n 
mentioned in the first account of the trigonometrical operations. 
The measurement of this, the ſourth base, commenced: on the 
th of Jung; and was continued, without much interruptian 
from bad weather or other causes, till the 28th of July, when it 
concluded with the 26 fd chain, the overnlus, 38,92 1 feet, being 


carefully determined, by means of a silver wire and pointed 
plummet let fall over the point marking the north · west extre- 
mity of the base. Fhe two chains were then carefully compared 
with each other; when it was found, that the wear of the chain 
A was exactly one division on the micrometer head, or 2 
part, of an inch. As the length of thi dase is nearly- the aame 
as that on Sedgemoor, it was, reasonable to suppose that the 
elongation. of the chain, by the working of the joints in each 
measurement, would be found the same, provided no injury had 
taken place from accidental, cireumstances, or rusting of the 
pivots and holes, during the time the chains were laid up in the 
Tower. After the reduction of the base, I shall have oceagion 
to show that my ideas were correct in this point, as Mr. Brnar 


ä e Fempagured 1 70 deins. 1110 1 + 8] 10 9 fi 2315 4585 24 14 


: * 
5 . : « | ' * 5 ; 
5 * 8 7 0 0 _— ** FT. xk 4 1 4 v4 
5 4 1 2 * * 4 .- * 4 NY T # Þ # . Ys » . * © 1 
# * , 3 7 ; U « : 73 # Lo . 4 4 ; a 5 . a 1 9 
C-£ LMI : 75 ; 163 4 i „ ; | #6 8 | C $4 Rf & 3+ LAS tt % 
* . ; « « » by . : . - o * 3 — 
. 5 q « 


Ang tes 2 the e Tricngles aherved 7 in the Y ears 1 800, 1801. 


— 


% %% * = 4 "oat, EZ tis * ** 4 - bags i 4 * * : ' : 3.5 . A | f 4 4 , ® '# ; 4 | 5 . 4 "4 a * G %- 4 5 
34.7 3} 20 ZE 2 5 #3 Olek 4 Brac *. Hill. wi xd „ #6 8:4 a 7 „ "6, WJ * 85 
ON * 8 : : acon Ht WO | 3 Aeli! 7 FE 4 E 
Between 1811 0 5 (0 97:7 (VI TASI SPS GHOILEL ee 
L ; : 5 7 . - 8 
Mi 4 * : 3 7 E $ 
The north a tt nd rb > 30% 19 
e - 80 N 19 
rt 1 9 115 2 1 18 £7: 6; 
1145 + % 'Y A. # L KL If x | 20 3 
N 3 4 N 
* - ; 4 "8 f N 7 P 2 
Tar” +5 . : 4 1 9 3 & 8 3 : * @ - - * N 1 # 8 * 
en . FIAT ET #264 £3 Sine Wt, j 3 4 


Gringley and auth end of Base 


9 


j 
; ongh 


o O%h - onbaibacHh bas 188 1109240 
ebene and hyde — 15 9 

„„ 
175 ). 


3 At North" End of ow. Fa 
2 7800; south end of Base Ig. b eg 102808 
Bp, « . <1 19 
e £07 1 4 17,25 | 
Beacon  Hilband, Stingley - ati 22 46 555 ron 
Py \ 8 | a G4 7 e : | | 56,23 
12 „en 5 101 8 1 
Sen e South . eh. note bet 10 
dude ki and north end of Base 98 55 26 
| 1 on | | w 
[ Ge 4 of 2 | 
A AY 08 | 


4 


275 


5 . 5 1 
Beacon Hill and Gringleyx 114 51 315 


| Kass 2 08 At Gringley. | Doge oH biis tt 4 
Beacon Fil and south end of base "tf 11 5,25 
6:08 „ 
B Sr CCC 675 9 
8 9 5 | N 7.25 
E 8 3 * 8 


2 


. 
* 


+ 
— 


2. 8 * 


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10 


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8 
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77 
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\ 


41 Ss 
ringley 


. 


* 
— 
” 
« 
« 


wo 


1 


5% 


* 
x $4 


4 
7 


4 
3 
8 

(3 — 
$47 857 
— * 


* 
2 * 
* 


4 * x o 
IT $i. 
* 

mY 


1 


Ashfie 


ee 
+ A E 
d 


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an 


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— 3 ix — 5 F 
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Bardon 


* 


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r 


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2 
3 
7 


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Castle Rin 


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5 Fa i os 3 4 8 4 


. : 3 


utton Ashfield | - 21 27 19,5 
| | | 3 


* > | AS] ; 
wo 3 E . N 
N ; _ _ 4 37 IP r * £ 
\ 4 % — N >» * & > { $ 4 | 1 1 3 1 09 * 
\\ a : F 4 5 5 N 5 * x 5 2 4 : 1 — 
. N : * . 4 
* , 0 
OLIAN Hl — „ 
K APO” > ** 7 : 1 5 ; * 
1 + d 
* 
4% 3 
l ” 4 * 
7 0 o 
— =” * © * * 5 , 
2 1 + b . , * ; $44 8 ; 
= 4414 135 BR 5 7 


: PE „5 „18973 | 14675 


T3 WF 2 „ 13, 
eee 


® . 3 


* 
* 
* * 
* 
* * 
* yer . 
| 
— 2 * 
7 - 


- - 
* — 


. 


, * 
man 2 5 ? * 
* KS */ ar lk CO SITY 13 * "x — 1 1 
* s nds ay % e 5 tf Ws. 


8 » ; - 


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i 


MU |< | gn 47 9% 40,5 

fn, Bo © as 
ele $M v es | 1 — 42,5 42,25 

| # AS © | 929 N iE nell 43.23 1 


Castle King and Bandon Hill - © 2 


1 1 


0 JON e W. 
| | Arbury Hl and Bardon Hill 10% 3 eee 
3 3 Po 4 Os > 0 14625 
„ [REOE. $048, ff Arbury Hl. $990 bow NOT mob? 
| Corey and Bardon —_— * 14 82,3 
R 2.1. ML aka 34.25 
es The apparent length of the base was 259 chains 
of 100 feet each, + 8 chains of 30 feet each, and the pet. 
|  overplus.of the last chain viz. 38, 321 feet 3698,91 
The chain B, before the measurement, was found © i 88 
to be 16k divisions| on the micrometer-he Fn, 
„ Fot the obvervations of the angles. of the ini couthward of Arbury: Hil, | 
dee the Philosoptiical Transactions for 1795 ,and 1800. | © 7c 
k f ) 


than: A, "the- agg of which, 
A {SDEN' $. determit 


gives A o, 186g parts of an inch too long. There- 
fore, if to this is added half the Wear, Viz. 0,00192 | 


parts of an, inch, we shall get 9775 25 Which x 269 
me 2,709 feet. wich add * LS > a. oth 
The 50· feet chain, before the measurement, was 


compared also with B, and found to be 24 — 


on the micrometer-head lon ger; ; therefore, 2294 
_ == oog 14. parts of a foot, which likewise * 69 — 


ain, the sum of all the degrees: choyn on 1 the 


1% og As 4; 12 11 


; _ ſe 


meer was: gang wherefore, 2 54 * 


269 38 5 . 3.87136 feet, is the correction for”. 
the mean bent! in which the base was measured above 
542, the temperature in | which the chains were aid. 
off, and this VVV 

. Finally, for the reduction to the tem perature of” 


62 5 or 8 on the brass scale, we have —— TM Es. 


1,720 feet, which subtract RE TR 
Hence we have the true length of the base, in the. 


* 


temperature of 69%, = B 


(ee, £2 


Th 8 ation, may be taken 100 feet id 9 bite 
d inches, in the temperature of u che, ds ae 


* * 


* 1 
LF fi v3 33.3 


5 5 3675 


4 


1 8 
25 ; 
4 * # 


» 


= 


L 26945, 715 
The surface of the ground on | which this base was horizon- 


tally measured, is said to be not more than 35 feet above the 
surface of the sea, in the mouth of the Humber, at balf tide. 
And, although it may not perhaps be a very correct deduction, 


yet, a I understand that nchen, arose out of a levellin 'S 


þ- 

” 7 

1 4 : 0 . " 88 * L 4 / FRO F 274 1 7 
Kaen ei bw 4. aired em / / - m ts HA bt. nne Wal Fr P 2 N * 5 P 


— 
* 
- 
— 
— 
-. 
* 
— 
- 
- 
4 8 28 «4 8 
n 
4 cv * <3 ; - 
CE = 5 HP EINE W*2 2.4 vl 


to sense, in our con 
situated on the nee of or, PT all U t 
take 26342, feet ſor the true length of the base: and A 
cannot exceed or . short of that quantity, 2 NO a 

inches. , mie ee en Us a bobbs ei 


— 


* 


| $ od | at 4 
* . OA EIEE 405404 8 4 # „ 1 


Recent at Comparizns of the adult 4 ana | worki ng 


7 þ 
* | AP 
4 # 4 8 wat 2 ) Ar 12 


- the Points inserted i in the cast Tron Bar. 17 20 a 


In the duction, of the foregoing h Se, 1 have taken it t for 
granted, that the standard chain is precisely of the same length 
as when it first came out of the hands of Mr. RAMSDEN. Cir- 
cumstances which need not be mentioned in this part of my 
paper, but which, in their proper places, will be . have 


induced me to get both the long chains re 


therefore, at my request, pr 1 the bar and ad A and lately 
went through the re uired ope tion, The e were as 
olle w. % 8 . 


wang * n 


* 


The chain B was wy nnd | in fo Successive > removes, 
the first space of 20 feet haying a thermometer in the middle of 
the bar, which stood at 48˙3 the second space or remove, having g 
the same thermometer at 485,2; the third, at 48*,5; the fourth, 
at 48,8; and the zth, at 48,8; Which gave the total length of 
the chain = 100 feet T 0,077 parts of an 1 inch, in che f mean 
 femperature of 486. F 
The neee A was then measured in bre SUCCESSIVE. re- 


+ 0,198 parts of an inch, in the temperature N 
From the Table of expansions in 'Vol. IXXV ef the Phil 
Traits. the tfference between the expansion of a rod of steel 


* 


* 
n — | 1 - $82 or wt. nm 


* 


1 
Yam 
* 3 O 

A. * 


the} a on the þ 


fit: 2630 10 A N 


. 


* 


— 7 1 „ 


ID. 5 l 
S n- — og al Nen 


% 


i 


! 
1 
i 


— 
75 yu 


ge 43 . lengths, in the 
Mr. RAMSDEN, are Stated to 


ad deduced 


r n L TIO 


be A= lebt 0,11455 inches. | 
B == 100 feet '4-'6,05885. inches; which gives a dif- 


þ 


** 
5 * 


ference zomething less than 785 of inch between their prezent 


11 the redigetion o i 


working chain A to be Q,1 2965 1 


rn ; — 8 is en 


the measurement — — If to this 


r 


r 


Inch too long before 
Whole wear be added, 4 
7 it, 100 feet + o, 1275 

| "an 75; from the late deter- 


” 
———— ——— — . 0 "He 5 4 A a. 
; — E — in", on et ew = CBE Nr — — HAS E ne at 
S ; 
? : 1 
; 
o - a 1 
1 , 


t 
7 

x LY 5 
A 13. 


Calculation 0 F1b e Sidbs of 4 neg 


8 Dunnose, in the Lil. of Wi a i Yorkshire 


In the former accounts of etrical operations it 


Will be found, that triangles have been carried on from Dunnose 


——— 4 8 a en . —— — = —— — 


to Arbury Hill. It will be proper to N them in this place, ce, 


3 Te 
_ 


that the genes: may be com BY 


4g 
+ 
£ 
£ 
ce 
* * 
y HH $ 
4 1 * * 
C 
4 * 
*'Þ * P f =» 
- 
4 . * * — ns 
” — 1 ; E | + & N * k 
- — x3 = 7 > 7 $24 ys Pal Bot os, : 
+ 3 S433 ads, £434. £ 3553S 1 * a 
e 8 . F. Mae 4 , 
. N 1 * L # „ > L 1 1 7 1 
>, R 10% 1 Ky * 33 Ti ; * 
\ oy : . 
& % LAS me Short os A1 
1 ** : ; : 
; 3 
. * a 
bi 
5 1 3 
— * * A 
EI. ae , - 
* 
= . 
* — 
* * 
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* 
2 o Np 
. Li 8 
wy I kg 4 2 
8 4 
® FG, 
hs 
* 117 1 
% A 
. 
* - 
— 
aa - 
- 
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P 
- 
wo — = 15 
. 
1 . 
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4 = 
* 
* * F 5 . * 
. * on 
P 
4 ” 
: * 
* * 
A * 
* * js 
52 & 
; WY, * — 
2 * 
BF. : 
. £0" — - 
6 * * 
= 
1 * 
— 4 7 


* * 


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=: 

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4 Ae : N il 
| Sl ut om 8 bade eck "Phi T 


Wis 5f? 142 . 115 2 . 7 4+ 


Set n ano 
| eee 0 


q — 
PEE 
3+ 3 . 5 
82 
= 
—_ 


PR | 
x 3 3 * % # Io > 7 1 £ . a 6 * » 
37 434 \#4 34 1411 i . 


, 13 21 4 . 4 » *. 


[Butser Hill . 1 84. 31 455 


Head 56 16 54.5 
a ere * A 8 E Ik? . 


SY. 3x 
N W e A 


hs 


3 
* 


18 


EE 


4446 1595 
nd Head 33 20 1225 


34 51 15975 


5 , J * mY n . 
1 * i 4 **. 4 1 J. 7 2 3 5 * 1 F % > * 8. * 
441 8 N. 5 * * * 3 ll” as 3 1 1 3 n 
r a ——_— * o L _—_— 
— 1 a | 3 1 TRE" 
< 4 AX # / « & * o J * 4 1 4 £4 
1 > of > . 7 7 } 1 rr K ; F 0 4 : K E44 * * 1 z Fs 
1 * 8 3 A | ; FE 8 5 AX 4 «+ as 


4 l 4 | 
—0,8 1 

—2,36 
— 1,88 


6 


+ 180 © 1,75 


* 
* 
% 
ors. + 7 
x 
— 
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i * 


| 


rs 


* 


. 
3.09 1,34 


ele how 2 Heath «= 


a 
- 


ind Heeg 


* A 
| 90 
s * 
*. 2 
* * 
Y 
* 
&* 


* 


u. 18 


les." 


9 N 
_— n TX 
9 * 
* * ö 7 
5 NF A 
22 * 
» +, \ Y . 


N ; * 
| : 
- . 
N 2 4 * * n 2 
5 ” 1 4 
* N 
a 5 - # 


9 OG N - 
9 e We" Ft: 
8 * 5 
i* - 
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* * 
4 * 
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1 * z 


* * „ © n TRY * ? 2 On 
1 F I * 7 FEY 999 — R 8 "TY r a; TY 
1 * 11 EF * * 
1 . o 2 
= 1. 1 * # 
* 8 * 
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* | - 
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5 * ' 4 # 
- 
— 
- 
. 
* % 
- . 
% 
- 
x * 
— | 
* * N 
x * 


10 18,25 |- 


Angles corrected 
for calculation, 


| 
| 


80 „ 3, 


755 26 


+94 


| Nuffield - - |78 17 18,25]- 
1 . 
f ; ; 8 Bagshot Heath 5 [105321,2 
: Nuffield from r- „ MOT Is . 
—— wer ae u, — hk: I . 8 h — T — 
vi. — 585 — : | 63 18 16 271 N LEES | 63 4x 17 ; 
e e 53 33 495 | 
N 3 * „ 0 7 * HE * : 9 
| 5 179 59 595 „ Fc Os 
8 Nuffeſd — 120557. 7 
©- : —— 9 — 3 52 e Ji 7 8 — * —— FT * 
| 38 48 13,25|—0,67| SE». 38 48 12,5 . 
86 4 16,25 — 1,211 86 4 15 111 
5 33 $393 - {=QoZ bi . 55 5 2 | AR 


2 1 ; | ng = * White Hoe Hu n 146603, 
5 e N arg. . N — „l 1 
14 : 3 6 EA RES . 


Brin 


White Hom Hill - — 


tow on the Wold -- 


of 


50 14 445. 
64 45 43,75 
64 59 32 


|—1,18 
—1,34 
1553 


«t 


8e 0 0,25 


by” F, 


"How ©. 


28 


50 14 45 
64 47 42,5 
1 59 3245 


228 3:63 


I White Horse Hu | - 


| 7 Bills 7 eee 
n 3 * r. N N 1885 ” ; 2 5 4 RS. © fa : wo ” 
wee ate; 32 34 43. 0,6% . 32 3 99. 7 
Stow on the Wold - | 6o. 56 6, 25 [—0,64| 1 60 5 | 
- wid: 86 2913,25 , 1 % 86 29 4 245% 
Bee e 0 2751 wo 2.37 e i 
| L engl f e 4hegd's 
pon from” - ] Brill — — — 128140 
| 8 "2 | 
' 
C ; f . a 4 : 4 , 


1 


4. aaa. of te Meanremen 
E W AG AR | 
| Brill - — 4 23 58,5 —0, 65 14 235755 * 
*. Epwell 185 o 18,5 1,10 1 4 85 en 
| 95 a An bo 35 455 Tp e 
N 2 180 0 22,5 F E [+0,04 | „ | 
: | [en all | * e. 
Arbu . * 39 57 455 —I14] - 8957: 555 | 
x1, [Epwell -- | 54 45 18,75 —,57 | 54 45 18,25 
* e 135 17 365 
1 17 85 180 0 0 n | 2,29 2 
15 j oe EE Hill F 
4 NG | 41 | Corley from 5 {ang _ ws 15 143827,8 


By the lat d the distance from Coney to Arbury : 
Hill is 1 17463 feet, which distance, and all the others consti- 
tuting the sides of this part of the series, are deduced from the 
base on Hounslow Heath, as well as that on Salisbury Plain. 
With regard to the triangles connecting the stations at Corley 
and Arbury Hill with the base recently measured in the north, . 
it will be proper to let them rest partly on that base, and partly 
on the side Corley and Arbury Hill. And here I would remark, . 
that in carrying on a series of triangles, whether for the purpose 
ol a meridional measurement or otherwise, it is proper that a 
base of veriſication, answering at the same time as a newone 
of departure, should be measured every hundred miles at least. 
With this idea, therefore, the foregoing triangles, as well as those 
5 . composing the remaining part of the series, should be furnished 
E > with three base lines, viz. one at each extremity, and the other 
e in the middle. In ee the . were the series thus 


. ——— 1 
cCeircumstanced, it would be right to depend on each base for one 
third of the distance between it and the one next at hand, and 
use the mean result, as derived from the two adjoining bases, 
for the true lengths of the several sides within the other third. 

Thus, if two bases were found at the extremities of the arc in To Cn. 
question, and one in the middle, as about Brill, the compu- „C 
tation should be carried on, from the extreme bases, about one- N 
sixth part of the meridional distance; and, from the middle base, 
one-third of the intermediate distance on each side; the remain- 
ing two arcs being determined from the respective base lines. 

That I may avoid prolixity, or the appearance of it, I shall — 
compute the sides of the triangles northward of the two — L 
before mentioned, from the base measured on Misterton Carr . | 
only, and use the mean distances calculated on the above prin- | 
Ft Gs when [ find the total length of my arc. 


Length of the Bas on Mixterton Carr, re 26342, — — 


— — * — ＋ * oy Fe : 
oof -} 3 3 1 „ i . les corrected] | © 
. Names of stations. e I Diff. Sher | Error, 2 | Distances. 
fon . % % » [age | © 
XI. North end of Base 60 17 16,55 ũ | | 60 17 12 
Pouch end of Base bo orgs | T5527 | 
V 
5 North call of | from . 1 
| | Beacon aue South end of Base i ; 
. Beacon Hill | — 3444 42.95 e 2 1 | 
\ X111, North end of Base {| 74 46 56, | {| | | 
VG |Gringley on the Hill || 70 28 22,25| | ; 
iS Ht 4186 6 1 6 1 8 5 333 bs 
! | Gringley from \ Beagen Hill © 8; 
=. | H 2 2 ; | : 


* 


— 


An Account of the Measurement . 


4 - 


„ FA . on@ = * 
' TBeacdn Hilt''-  -} r wel Res wah Loan: þ | Sas 
xiv, {Gringley.  - V 1 
[South end of base 114 51 32,5. . | 
I. 7 4 
a þ In E Fr $5 
eo Tivo. 0 1 1 1. 1 
Wd it ok ö Oninglen from Beacon Hill 8 | | 7 2 
Wherefore the a mean an glxtance f from Gringley to Beacon Hil is + 75068,1 „ 
' . 3 n 
— 2 1 90 a D — . — *y 1 98 


biene eng. 18” 49. + 
uv. [Beacon Hill 138 9 16 1 
| [Gringley i 7 9, 6 . 
: : 4 „ "7 | 
$53 oi ag 85 * 
: BE 8 5 18638 
1 ö — — — nooner ＋ — — "x" 8 — 3 5 * 
78 47 2 1,01 * [78 47 1 . 
54 52 37,5 p—<0xa44.') || 3452 38 J. 
46 20 24 (—0, 22 J 46 20a 24 | 
* * Or PIES 3 1 


130399, 
115339.9 


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80 28 57,29 0585 80 28 57 1 
39 8 38,5 —%%/ [ [39 838 | 
60 22. 25, 5 [—1,00 2 x 1. 
: f M 8 „ 21 * : X 1 vs = : 54S wy 
hw 01 | ee | 
I FHeathersed „„ 
it from 1 Gaſs 
Orpit from — 1 Sutton Achßel ie 
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kala! Hil from {on Sutton Ashificld 


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38375, 2 


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3 FFT. 3 F . = $ FEE oP COIN 
Bardon Hil N add 53 5 1 %%% | 228 


Hollan Hill 


¶Orpit 21375 


8 RES 2 62 8 25 
os » 4 I 4 "i 


74 52 38 


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Bardon Hi 


Castle Ring 


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| 68 24 3 
. 314 


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il (180. o 3,5 | 2,85 [+0,65]. 1 8 
i | | 2 : „ ? b, 2 
| ; Lg Orpit - — — 1153235. 2 
| Castle Ring from Bardon Hill! 5 367 17.8 
| | 
1 . 5 ; "ENVY s - 


- 72-32. 463 


* 


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W | 
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* 2 3. 25 


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Castle King 47 54 4,25 5 | 
 [Bardon Hill — | 59:32 32,25 —0,9 44 | 39 32 32. 
123 * 12 1 : 1 93 a | i 
<5; 0 Bardon Hill- - - [i634 
; 6 fr DEER. S 6357-3 
1 | Corley Ne „ 89% 
- | 34 14 33-5 0,98 


_ 11804260 
11174571 


54 8 An Account at of the Meagurement - 
" From the las triangle, we get 1 Je. for the tance 


— tance betweeri those stations is 717403 foot: Na is, e e 
a difference of nearly six feet between: the two determinations; | | 
a a quantity. which cannot be considered unexpectedly great, as 
the side is more than twenty- two miles in length, and the whole 
series nearly two hundred miles long. If the computation had 
been carried on from Dunnose all the way up, the bases on 
Hounslow Heath and Salisbury Plain would have given the 
length of that on Misterton Carr about one foot greater than its 
measured extent. If the sides of the triangles contiguous to 
Corley and Arbury Hill be recomputed, from the mean distance 
between those stations, viz. 117460 feet, no doubt whatever can 
be justly entertained of the general accuracy of the whole. These 
mean distances, as I have before observed, will be used in the 
calculations of the total length of the meridional arc. From the 
Base in the north, I have numbered the trian gles downwards : 
| the r reason is s obvious. 


caladuin of the make onal Diztance between Dunnoze 1 
pe] © Clifton, : : N 
Tp do : ag) it will be right to compare the distances of the 
7 several stations from the res pective perpendiculars, both of 
8 Dunnose and Clifton, a as s derived from the obgerves direction n of 
hs each meridian. _ 
Ihn the Phil. Trans. for 1795 it will he 2 Seen, that the — 
of the meridian Was observed at the station on Dunnose, in 1793, 
the staff to which the pole star was referred being placed on 
Brading Down. The an gle between that staff and the meridian, 
0 page 517 of that volume,) was found to be 21 140 1178.5 as 


» 
> F< 


several 
observations. 


The angle between Butzer Hill a the staff at — e | 
was © 15' 83%. This, with the above angle, 2 oy bak Levin and 


| particular OE of the series, gives, 


The Bearings of certain Sides from the Paral lels to the ue 


„ Dunnose. ON 
. Dae and Butser Hill — = 20? 58: 9 NE 
Butser Hill and _— N - $4 20 17 NW 
_  Highclere and Nuffield | Wh. 35 30 40% NE _ 
Nuffield and Brill 4 51 15 NW 
Brill and Arbury Hul Gele 7 - 12 30 17 NW 
Arbury Hill and Bardon Hill 7 4 57 NW 
Bardon Hill and Orpit 21 21 9 NW : 
Orpit and Heathersedge 1 9 255 . 25 52 NW 
Heathersedge and Beacon Hill 8 1 52 17 NE. 


These bearings, and the Wp sides, give the A 


dutanoes on the meridian of Dunnose, viz. = 
Feet. Miles. 
Dunnose and Butser Hill 131 * 24,86 


Butser Hill and Highelere 12222, = 23,15 
Highclere and Nuffield - 97984,7= 18,56 
Nuffield and Brill „ 91753, 17,88 PT. 
Brill and Arbury Hill! - 14g054,1= 27,09. 

_ Arbury Hill and Bardon Hill 178792, 4 3,86 
Bardon Hill . — 1265678 = 2,97 


r 1 Beacon n 43480, = 8,28 


— 1650 0 the tons" 


* 


7 4d 1 4 . — 5 a ROE Tb +) 
edt dy oedema. % bots, 0 12 * S LSE te 
Y - 5 ; 6 % 4 wa, kl . . 5 , 3 m 4 . 4 „ 
1 W my W Wann nnen W. N Wan n * e er 2a) 
= Lf WHY * 1 * 


derived f two Aan azimuths of ths star, . by [ 
nputed: AN "applied. to er 'out accurate” 


| 101203, 19,17 14 TF-19 


N 5 , a 8 pw. 
© *$# 0 * es , *% * 
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CEO SE ALE; 8 1 0 N 


7 i DD | An Aron of the Metnwrenient 


5 beten Clifton: and the perpendicular to the n of. 
Dunnose; which may be taken for the true length of the arc 
itself, as the distance of the former station from the meridian . 
ol the latter, is only 4770 feet. 
I the angle between the E a the Staff at Prading — 
was observed accurately, there can be no doubt of the corrept - 0 


U 


33 


ness of this determination; but, as it was right on my part 1 


. adopt measures for bringing 1 it to some proper test, I observed, 
as before stated, the direction of the meridian at t Clifton. The : 
: particulars were as follows. e - | | 


* 


| Obterved Anighes Wrüben the Pole "ey ben” at its nden N 


Elongutions from the Meridian of Cli _— and the mA RE 
over the nb at Gringley on the Hill, 


August, 1801. 
| Days . | Evenings, ame 
. 100? 45 46” al e Dory ted 
5 ich. 5 = 100 45 45.5 . 5 106 39 "34" 
"13th. =. 200.459 306 99 99 
26th. - = 100 45 495 | Ss 
17th. 100 45 14 100878808: 
18th. — 100. 45 9 106 39 8 
1h. 100 45 46,5 106 39 27. 


Af. a mean of all the evening observations be taken, we shall 6 
3 get 100˙ 4 42% 8, for the angle between the staff at Gringley | 
and the star when at its greatest eastern elongation from the 
er „a- | 
tions be taken, we shall have 106 g 275 for the angle between 


merdian. In like manner, if a mean of all the morning obs 


ame staff and the star on the western side Hence, half their 


— 
7 
, % 
N 
%. 
1 4 
hd * 
* 
- A oY 
mY 1 
wow — N WN e 22 — 9 * * —— 3 28 TY 


en de nr ITS 
* * 


n * -. 
ke Fs * 
1 * * 
115 * * 

© % 
3 
. 

- 
* 
* 


7 This, with certain angles of the series, gives 
oy 91.91 e 88 pos „ 
Arbury Hi 3 12 31 0 SE „ 9 
8 „„ 18 48 i. „ 
> ghclere and Butser Hill - = - 34. 20 49 'SE ( LD | 
5 4 7 0 . - 20 58 9 SW. * +: 5 WE, 
: following. ; | | > 
2 101206 r ee BY . 
Bardon Hill and Arbury Hill - 4757585 „ 
Arbury Hill and Brill — 143047, 0 e 
| hite Ho rse Hill - V „ 
WV. and Wee 960 1, % e | 
3 1 clere and Butser r Hill!!! 1222 19,8 e ee e 
- barer 1 Pe, wood oe ob | 
: feet, is . 8 a 
det | to the meridian of 
Clifton; or, as regard to the sum of the parallels  . —_- 
to the meridian of the former, the 1. EUR 


wo results. _ may, congequen 


1 , && ens "SY N. 9 ad 
3 ; 5 N red. 3 7 RN r N 
3 1 f f df 1 J 8 
13 5 : . * 


1 „„ 1 have pron in a former part of this atoount, that the 
3 VVV zenith sector was placed 64 feet from the station at Dunnose, 
V and 34 feet from that at Clifton, the new points deing due 


a wy South of the old. We must therefore add 3 feet to 1036334 
„ 36887 feet, for the total l. þ of the are of the 

E | JJ Yb Ts, 
= DD. The sum of the parallels to the meridian of Clifton, reaching 


ʒ p; down to Arbury Hill, is 45004745. feet; and the distance of the 


| Autter from that meridian 1996 feet. | T his is, in fact, the meri- 
' dional extent between the two old stations, as no correction is 
6 „ requisite. | We must, however, subtract go feet from this distance, 
5 : as the sector was put up 344 feet northward"of 55 
„„ To Arbury Hill. Therefore, 450047, — 3⁰ =450017,% food; is the 
length of the are comprized between the parallels of the new 
i ß; Stations at Clifton and Arbury Hill: and, subtracting this from 


. | . 1096337, we have 58631945 feet, for the distance of this latter 
Eo ; S 4c—ẽtation from the · point over which the sector was. placed at 


Z e 2 Although the zenith. sector was taken to the Royal Obser- 
3 . vatory at Greenwich, rather with a view of collecting materials 


3, h bor finding the latitude of Dunnose, than to answer any other 
N „„ purpose, yet, as I am provided with the means of * be 


% 
| distance tween. those p aces, an hat with — 
f — 
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fact, which were, the observed directions of the two meridians 


he t; £1 
Latitude of Grid on 


7 8 ; 1 by N " | ' 4 . N * 5 > 2 
15 * wth 3 1 1 3 6 Y . F Wo; 2 0 * 3 * = « 4 of - * 3 : 
51% e ee arty ot 5 2 8 111 


Ba 


In the Phil, Trans: for 1795, the station on n Beachy Head i is 
hown to be 269828 ſeet from the perpendicular at Greenwich, 
and 58548. from its meridian. In Plate XVI. Fig. 2, of this 
account, let DpB be a great spheroidical triangle on the earth's. 
surface, P the pole, and DB the two stations at Dunnose and 
Beachy Head. Let also PGM be the meridian of Greenwich, 
[LG. and M the point where the parallel of Beachy Head to 
the adicular at G cuts that meridian. Then, from the 
above values of GM and BM, it will be found, that the latitude 
of Bis 1,08 less than the latitude of M. and that t too on any 
hypothesis of the earth's figure. Therefore, the distanee in feet, 
between the parallels of B and G, is 269328 + 103269431. | 

Now it has been. ghown, j in the volume above referred to, (se 
page 528,)/ that the meridional distance between D and Bis 
the mean of the two numbers 44258,6 and 44258,9 feet; and it 
must be remembered that, in deducing chose conclusions, re- 
course was not had to matters of assumption, but to matters of 


PD, PB, and the distance DB. Therefore, if 41259 feet be 
ken for the meridional distance between D and B, we shall 


„ _ 
| u ule of Greenwich and Dunnove» PEAS 


Hen Dow; in Dorsetchire, and Dunnose, I have wed the | 
==>; where d is the length of the required degree, þ thatdf | 


| the rent d Td, meridian, n chat of the degree of the meridian 
 kyzelf, and 5 non of the angle r oblique bend 6s. weld, 


_- 
* 
POR 
„ 2 . 
. 


| as and also the distances of two intermediate points: hm 
either, or from both, of i its extremities. And, to bring the whole 


«We have dligw:ſound the total length. ofthe inte 


The FORE ey be this 15 1 did not lovert, © on account tof the Wes bk of 
the note alluded to; OR I bs Prog ks _ Oy 92 24 


e os” 5 1 8 
JJ. Haviig the 8 of the ads on the brig any 
2 * * Ht ao that of the degree perpendicular to it, at the same 


„B point; ears e N NN = 
©  rection, supposing the earth to be an ellipsoid. 
Let EP be one-fourth of the elliptic n 0 the 
7 centre of the earth; CE, CP, the equatorial and polar 
. ;  Semiaxes; G a given point on the meridian EP. Draw GR 
. perpendicular to the meridian at G, meeting the axis PR in 
R; chen RG i is the radivs' of ne ee, ar the CEOs * wu _ 


pendicular to the meridian at O. . | 1 


| Conceive another ellipsoid FGSO to ol the given 0 one in 4": point G. | Thes, 1 
is evident, that if the curvature be respectively the same in the direction of the meri- 
dian and the perpendicular, on both ellipsoids at the point G, the curvature will also 
de equal on both figures, in Fan nn 


A 8 
in oids of an other kind. ts 
W N WS. pe 3 5 
* 3 e S 


„ 
LY M3 * 3 : 


Let M be the radius of curvature of the e at he point G; ; then, because 10 


is the radius of curvature in the perpendicular direction, if we take Fs (at right 8 


to RG) SN, and about FS, the axis to the fainter RG, de: 


' Ulipsoid FGSO, it nnen 
| ellipsoid at that SC: Dong” ; . 


. £74 
i . 4 „ 1 4 E.G & - Ak y . 


** EGP, or to ce plane 


Let OGR be the plane of an lg, inclined to we 1 


705, in a given angle FRO, whose tine and cosine are 3 and e. Then, a since RG, or rather 


its e 2 n the plane PORE: 8 is 


for the — — e — an RF or N ahd RG — be 


5 * 
te oh $477 2 9 K 


| d. and 9 ene, the ; 


, 
* * 221861 e LEE 137 2 


a an CT OS 


OY: p64, 


* 
44 af 


a 1 An Soi n Tor bes bo 
in calculating the distance between the pa rallels. of latitude 
of tw two, places, connected by means of a Ti 10 opera 


tion; regard must be had Y their difference i n 1 58 | If the 


Fay oy I 4 a5 2 & 21-4 


& 3 * 


* 


triangles run \ nearly, nort orth h. and South, in Which e case stations 


„ % — 


124 ; 


e two m idians ans, it is suffi- 


„ * 


su apposition = the earth's 


BA 


CIET >: 


surface, being a plane; ; but i if, on the contrary, the triangles 


from the two meridians, or even partly | do 80, 


* 


off obli iquely, an 


et 1 3; ory TI 


- « + 
5 i ». "+ 
. 5 Py L 


* 


By 9 Þ f 
-3 8 
* 
e 


7 


ö i.the 82 __ Jarirude, 
We miay likew ise remark, from "the nature of radit citvat re, at bak amt 


* 


8 3 


* 
3 
* . 
0 * 
— 
* 
- 
1 ' 
* % 
* * 
* - 
* 
5 * 
. - 
, 
* I» % ” 
* = 
* 
- 
5 — 
2 FP 
* - 
* 
* P * 
* 
Py .* 
4 
— . 
- ® . 1 
— 
* » = 
. 
- ” 
* „ 
* 
* 
4 - 


and then returning again, a different 


24; ” Ad, i if D be put forthe Kehoe aer EI x 


tinually varying, a1 


origi nates from the 


manifest that, . een all dhe ct angles. should be 
used, and not the horizontal ones; with which, after the bearing 
of the first side with the meridian has been reduced to some 
plan e beneath the earth' : s Surface, 4 number of chord lines 1 in 
the plane of that meridian are to be computed; the aum of which, 


augmented by the differences between thase chords and their 


7 


Un 


Fs % 


respectiye ares, will give the true meridional distance. L have 
been at the trouble to. calculate the distance between Clifton! and 
Hes on this principle ; and find the length of my arc to be 
| 10963395 feet; which is, about 21 feet more than the distance 
determined by the other mode of computation. An advantage, 
however, attending A calculation on the princ iple now spoken 
of, is the ability of calculating 
one station from an extremity of the arc. This, if the instru- 
ment with: which the direction of the meridian is observed be 
not exactly fit for for the 8 


22 


WO 85 


* p | 8 Gi G 1 


, pretty nearly, the azimuth of any 5 


— 


* 


p- 
* . 
« 
* 
1 
* 
> 


n 


AR Lt, SECTION SECO 


% 4 de W 7 
„F 148 4 FC N * 9 pr * 
5 . 3 3 A 1 7 & F * © Cz p Ty 8 1 7 BY * * 5 


1 4 


at the Station n 


: YT 


= 


was oa ep W and in a direction 


* 
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ha 4 
* 
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A 
i - 
* 
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- 
= . 
- 
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+. 
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* 
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— — 
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4 |; 45.4 


ed for a a new V station: : its distance 


* 


T7 


* 


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» 


1 > 


* 


4 
- 


due south. The 
of which, on 


5 
x 
5 7 


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dire Wal ori roving 50 5 I: ie eee 


5 
12 


Eaſt Cowes ea n 


: e 


1288 


"the lib, me angles 

obeliok an and the 8 obj x taken; and applic 

mentioned 0 Shall g the” angle bet de Obelisk 

, . 

e e . 
„ p FL Ot Ee + 99 . le NCR £7 
| "drove. four long stakes 


ont 


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d the exact. 
xamined how 


— 28 12 e 


ache axis 


140 oe 


level, : and the axis itself 5. determined 
line would bear, and then e 


. * 


1 
wor 


—— its e the side of the 
the top 'of the obelick appearing as a vanishing. 


# 
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Y _ 7 


sector 8 half round. It was ho again introduced into its 
supports, and the interior stand moved, till the wires in the 
focus of the lateral telescope appeared on the obelisk as before. 
- vernier was then examined, which again stood at A e 
This being settled, the sector was turned round, till its vernier VVV 
stood at 176 23“, on the azimuth circle, in which situation, the . 1 
plane of the divided arc was necessarily parallel to that of the „ 
meridian. The task of observation then nm, and, the 
| performance of it was as follows. _ 


3 DG,” : , 


| Observations made at 3 to determine the Zenith | Distance of 
WO * Draconis. | A 5 


Point on the Lind, 1* 50 North. 


- 


| Day of | Face of 1 4 IDE | Zenith 2 Zenith distance een Dsl | 
the ſthe arch, line. tion of | in revolutions reduced. ter. 5 | 
month. W. or E. I. the star. „„ 52 I Above. Below. A 
180 ter. div. rer. div. © rev. di.. | taches |, * [.* = : 
May 11 W {A 9 4.829 17,9 1 50 0 13,08 | 1 49 46,90 28 »85 | 43-5 | 435 
; E | 9 16,95| 8 56,0 1109.95 40, 2 28,85 | 36,538, 
234.259 47.5 13,25 46,73 28,92 | 34.5 3s - 
E $, 38-16] $-14.0 | 18,16 |. 4382] 28,82 ]-35.5 | 34,5. 
| W | 6,23,00| 6 30,g ü 87. oo 52,99 28,45 | 515 | 51,5 1 f 
E 14.02 8 2, 12, 47.96 28,49 | 52,0 | 51,8 9 
„%%% $5-79 28,54 | 52,5 | 52.0 | 
E 2 39.50 9 295 | 10,00 49.98 28,79 | 53,0 | 52,7. 
W | 8 19,29{ 8 2357 * 4.41 35.58 28, 95 54,2 | 53,0 
E '} 3 56.61} 3470 | 9,61 50, 37 28,75 | 59,5 | 60,0 
W IS 38.52] 8 41,5 A 2,98 57.02 28,82 | 56,1 | 58,0 
E III 31.8711 21,5] 10,37 49,61 28,81 | 52,0 | 51,0 
r 9% 2273 | 57:5 „%%% 
E [* 7:05 09/197 |. 7-33] N 28,99 3 655 | 55-5 5 
K . 


Obe 4 Zenith Divtancss 77 y | Droconis. 


| Point on the Limb, o? f $8. North. 


Plumb- | \ Ny Zenith digtance F eee "ON 
- line, tion of” | in-revolations | reduced. ter. 
Yee: the star. a} RR 5 
a — — ERS" — — — 
rev. div. [rev. div. |* rev. div. E 
[tO 15,5213 48,1 o 30 3 32,76 0 53 30,10 | 29,0 | — 
| 2 38,0615. . | „ 3523,62 28,85 
47.30 t 814] 34.10 31,45 28,85 
7 32, 38 3 49-2 12,18 39,54 28,9 
9 40, o0 [13 15,2 34,20 31,55 | 28,82 
| 7 20,70] 3 29,5 50, 200 + 47,58 | 28,34 
9 36,3513 20,3 42,95 40,31 | 28,79 
48 25,26] 4 334 50, 86 48,24 | 28,20 
9 48:33 [4 374 — 45-07] 43:44 {28575 | 
8 32,66 4 3944 52,26 49,64 28,82 
18 32477 15 17.9 44-13 41,50 | 28,8 
8 9,48 4 17,0 51,488 48,86 | 29,97 
br $2.98 lig 40.0 e ee 128.83 
Observed 2 enith Durance of 45 4 Draconts, 


Point on the Linb, * — North. | 


June 13] E 9 3 $3.1 bn 15 1 25,34 6 16 Wes * 28,8 | 49, 
 14| W | 9 2381] 7 155 44.31 3330 28,86 
16 E 10 18,90 11 46, * 27,00] - 26,74 28,77 
18 W 1 11,65] 9 32,9 | 37.75 36,91 | 28,8 
20 E | 8 18, 20 9 46,7 | 28,50] 27,64 |28,97 | 56 
al bes hog] 9 527. 37-33 . 5505 28:99]. 


F | ET ro 
Iune 134 E 19 77 re 46,0 4 1.40 3 I1,15 4 43 8,46 28,8 
. 14} W | 8 16,17 53,0 20, 17 150 28, 86 
16} R 13 15.6216 27, IS 088: - 8, 28,77 
18] W III 10,40] 7 41,3 | - 18,10| 15,42 | 28,8 
20] E © 8 32,1011 47,0 | | | 14-90 I2,22 1 28,97 
21] W 8 255 7 431 [i 1 18,36 2 


| Obzerved Zenith Fe of 4 c Draconis. 


Point on the Limb, i 4 North. - 


oben; Zenith Dittince of 51 Drazonis 5 


Point on the Lib. e 2 26 North. . — 
— * ry — — — — — — a> — BT OY 
Plumb- Gew Zenith distance | apes — Thermometer, 
r the star. and parts. ' 1 Above. Below. 
ſeev. div. {rey. div. e rev. div.... | [inches | * | © 
7 42,00113 11,5 % 20 I 28,50| 2 23 25,84 | 28,8 495 | 51,0 
8 10,63]. 4 33,3 | 36-33] 33-68 | 28,9 | 51,8 |. 50,5 
1 9. 0,oo|[12 28,8 | 28,80] _ 26,14 | 28,8. | 59,0 59,5 
10 48,27 7 11,5 36,77 34,12 | 28,8 | 50,2 | 50,0- 
| 8 47,43]12 21,0 32,57] 29,92 29,0 | 55,0 | 56,0 
1 2:23] 7 2651 . 36,751 3408 | 29,0 | 535 1550 
Oberved Zenith 3 Dee of 6 Draconis . 
Point o on the Limb, 4 5' North. 
. . 9 2. — — nmr 
1 N : i 25 | + 
W | 9 18,20] 7 15 4 F: 1 | 45:60 4 6 44973 28,85 | 43,5 | 435 
E 13 ' 3,04j11 39.0 46,01 35-17 | 28,85 | 40,5 41, o 
W {ro 2,03] 8 18,4 | 42-03] 41, 80 28 9236, 338,5 
E |8 12.869 7% in 2. 81 
E | 9 29,34½1 15,8] 45,46] 4463 28,79 535 31,5 
W .| 8 2956016 347 | _ 53-86] _ 53,05 28,86 53.5 | 54,0 
| E | 4 966].5 5601 b,34] 135,51 | 28,75 | 59,5 | 60,0 
W | 8 45,33] 50,5 33,833 53,02: | 28,82| 56,0 | 58,0 
E III 44-53]13 34.0 48.17 88 28,80 52,0 51,1. 
V8 4495 6 47,0] 5 96] 54-I5 | 29,0 | 58,2 | 58,0" 
E 10 34-60{12 45, 49-49 * 28,99 | 55-8 [55 
Observed Zenith Bae of 16 Draconis. 
SETS | Point on the Limb, 25 Leia 
EET r 
W 10 2 4320 z 40 2 18,8 2 - 9 55 28,85 
W 10 27,15] 8 9,0 18,155 16,37 29,92 
W | 31,976 14,0 17.87 16,09 | 28,82 
C 9 38,25 7 11,5. 256,75 24.99 | 28,5 
E 428,90 1 48.3] 396% 37,86 | 28,8 
W 31,63 6 101 27,03] 25,87 | 28,86 
E | 3 51,90 6 14.5 21,60 19,83 | 28,78 
E III 28,70[13 50,1 - ob ; 19,63 | 28,80 
; W 18 25,61] 5 352] agal - 37465 {28,9515 
eee re e K 2 


ED - ibn Zenith, Divtance. of 1 1% „gn, 
5 Point on the Limb, : 25 8 North. 


r r IOIY * 1 - _ — 
Day of 1 of Plumb- - | Observa- eam distance Zenith RR LOR 8 Thermometer. 
- the ſthe arch, line. tion of | in revolutions | - reauced, ter. 8 255 
month. . or E. Is cke stär. und parts. ' 4 + { Above. Below. 
«org |; 5 — Ter div. ber: Ws. „ rev. div, 2 7 e 
June 13] E, 9 26,60 12 33,5 20 3 6,90 2 23 420 | 28,8 | 50,9 | 50,5" 
14 W 5 5098 2 37.0 18,98] 15,30 | 289 | 52,1 | 50,0 
10 E [8 49.45] 6 n 5˙26 | 28,8 | 59,9 590 ˙ 
- 18] W 10 12,05 6 58,8 2 20 3 16,25 13.57 | 28,8 | $0,1:| 500 
20 E 9 983 bz 20,0] 1 7:48 [29,0 | 54-9 | 56,10 
21} W [11 1,83] 7 44 16,63] ; 0 29,9 | 55,0 | 53,5 


* > Point on the limb 2* *. 


 Obrerved Zenith Distance of 10 gn. 5 
Point on n the Limb, 0 40 Nori: 


june 13 E | 9 30,95 10 55-2 % 40 1 2425| - 4 23-39 28,8 | 59-9 | 50.5 

14] W 50, 5 4 51,8 32,25 31,40 | 28,9 | 51,7 | 50,5 

16 EB | 8 43.00 10 9,8% + 2550] _ 24-64:| 28,8 | 60,0 1 59,0 

18] W | 9 38,90] 8 260] 32,90 332,0 28,8 | 50,2 | 50,0 

20] E | 8 30,78] 10 oo] 28,22] 27, 36 ][ 29,1 | 55,0 56, o 
21 i, | 1 "A; 9 45s! N . 3970 BP 32,85 l 


28.9 13. [ 5555 


 Obverved Z enith "AMES of 7 Urse. 


_ Point on the Tris 4 10% North. 5 . 
* Fa Wo aſter « ar pnag ) 


= 1- 
3 


E 11 42,53 12 1 4 10 o Page 4 10 THIS [ | — 
io] E III 10, 50 11 42,5 31, 90 31-95 29,0 | 52,0 | 52,0 
i1 W. | 8 34.32 7 544] - 38,92 38,98 | 28,8 | 50,5 51,8 
13} E 9 54.86 10 29,5 33,544 33,69 | 28,8 487 | 4493. 
144 E 0 1,47] 10 34, 33,03 33,08 | 28,9 | 38,5 | 33,5 
15] W | 7 15,49] 6 33-6] '_ 40-89] - 49,96 7 41,0 4, 
17] E 8 54.00 9 29:5} 34-50] 34.56 | 28,8 | 46,0 | 42,5 
29} E [13 4303] 14 il 34097] 2 | 28,7 | 50,5. | 51,0 
June 5 5 W 3 3850 43,50 43,67 | 28,4 | 53,0 | 55,1 
8B E | 8 58,90] 9 36.2} 37-30] 3736 | 285 | 55,5 | 58,5 
12 E | 5 46,70 6 22.4] 34990] 3496 | 28,6 | 540. 54 
13] W 10 409,70] 9 56,44 ' 43-30] 43,37 287 5941 39, 
4 W | * 16,400 6 53:0 ; y WL 42,40 __ 8 42,47 28,9 60, 73 
161 E |} 9 3,0 g 4b - : 38,00] | on | 28,8 72,0 | 69,5 


+ imperfect observations 


14 In page 47. 10 * Cygni chould be 10 by h Ursz: chould be 85 8 5 1 Hereais ghould | 
be 385 , and u Herculis should dev.” ©o 7 


| | Obeerved Zenith Distance of 1 Une. 
55 E — Limb, of 15 South. 

n ene Wn — — 1 ee roo 
Day of | Face of Plumb ERR Zenith distance Zenith distance Barome-| Thermometer. 
the {the arch, line. | tion of | in revolutions reduced, {| ter. Ls 

_ month. W. or E.. the tar. and part...  _ - | Above, | Below. 

— — — — 3 Sogn ; 12 

Vn TT In arg? mon ee} 20D: Inches, | ® 8 8 
May 10 E jro 6,74[ 6 8,6þ 1 5 3 214 5 18 54-53 | 29,0 | 49.1 49. 

- 1] E. 9 8,22 5 40% 38, 35 3% 45 | 41,0 

14 W 10 4774 3 39, Jo, 86 18,24 | 28,9 | 36,5 38,5 

«2: 28]. E io... 9994.0 „ % -. 5789... 4% 28,9 | 41,0 | 415 
16 N 9131 13 5. % „ 50,69 1 | 28,8 |. 39,0 1. 39-9 

„ 17 E 19..0,46| 5 3.356,26 © $3.65 | 28,8 46,0 | 42-5 

June 3 W | 7 58,15] 11 4,33 47,15 4452 | 285 | $2.3 2.3 
e [9.6371.5 16] 53,72. ie 285 | 52,0 | 56,0 

..11] W 49 2 9594.43 12, 413,20 40,7 | 28,5 | 52,0 | 5595 
E. | 5.3200] 1 59,0} 52,60 ., 49.98. | 28,6 | 57,5 | 50,0 
13] W is 14,50] 14 40| 18,50% 49,8728, ] $655 56,5 
VVV 28,8 | 57,0 | 56,5 
1% W | 9. 4421] 12 497] 43% 4 28,8 | 64.0 | 63,5 
180 W [| 9.14450] 13 , _ 45,00 42,37 |.28,8 | 59,5 | 57.5 
, nant 28.8 2 
21 E 12 45,0 8 57% Jose] © 47-87 | 28, | 55:5 | 56,0 
"2 F Doubtful. 
- Obxerved Zenith: Distance of. 1 e . 
— Point on the Lamba, 20' Norte 

— wi 3 37-00] 10 $25 : 27% 27,54 | 28.8 | 45.1 44.7 

„ 7 E, 49,960 9.2, 2 29.54 29-59 | 28.8 | 46,0 | 42,3 * 

June 5| W 42 31.92 7 50 39,02 . 39.08 28,552,352, 3 
88 E Is 56,50] 9 28,1 30, 60 - 39,65 | 28,5 | 52,0 | 56,0 

1 W | 9 36,93] 8 55,6| 40,33] 40,00 | 28,5 | 54,0 | 55,0 
1 E | 7 47,74 8 230] 34, 34-32 | 28,5 | 6o,s | 59.5 
17 E 9 33-12] 10 8,23 34.088 34,14 28,8 | 64,0 | 65,0 

. "OOO | 9 28,30 8 45.0] 43,30] 42,37 | 28,7 | 57,5 | 5955 

W % e, eee 157 1 70,5 
| Obzerved Zenith Distance of 85 Haaf, 
Point on the Li mb, 4 25 South. 
ants Wi eee 3 

May 10 E [ig Ns 9 dls * 5 25,27 4 30 20,80 | 29,0 | 45,5 | 45,5 : 
.: 18} EK -].8 28,70} 3 25 26,20 21,73 | 28,8 | 40,5. | 41,0 
14 W | 8 4.16 13 430 - 18,84 14,36 [28.9 3455 | 345 

16) E 2 30,40] 4 11,2 25-20] 20,23 28,8 | 35,5 | 35,5 a 

June 144 W 3.45.36 13 33.6 8.24 3.74 | 28,8 54,0 | 53-0 

| $f TN 5 


PR. > 


3 4 % 

; 2 of 
#4, r 
* 


oa Zenith hu, of » hon 
. o South. "a 5 


2 6." - 


Day of 
tha 


ou. w 


* 
* 
4 
2 
a 
7 . . 


1 


N 


— 


* 


. 


SEES 


* — 


2 


33-39 


2 5757 


8 44» 4 
1091 


10 


Fr 44 


2 


$7987 | 
39-57 


7 


n * 


* 


882 
> > & 
NN 0 vr 


4 * 


| 8 ; 2, 1. 5 


[4 15 2 20, 95 | 


I 3,84 
19,84 


1 3349 


| 3 5.26 


11,99 | 


„ 
1 11,11 
5.13 


Pan 65-264 mo 
5 
py : 4 « 
* — 4 . 
1 — — 


pr tion of EE reduced. 0 ter. 
! the: re a, e e eee 
6 0713 5 1,02] 9 49 $6-51-1 290 — 4990 
14 21,1 1 5 | 4 

N 

1 


x: +44 "I 2 
is e eier, N 
6 2695] 17 5 49.85] 46,32 | 


2 
1 


%& 
* 


— — 9 | 
a _ 7 © , p 
Py _ * =" * i i. 3 
8 4 e 
' % . E 
4 n ww ' RY . ty 
2 "ks . i ö 
* o , 
«© OD 
Lg wn 
e 
w w 
© 


a 50 13 19, . 
6 2495 IL 182 5 
231731 14 144] , * 42-99] 3855 | 285 | $3.5 | $2 
© 1:33 4557 41, 38.34 1.2994 59-5 [3+ 
11 41,16 6 53,5] 45,66 43,11; | 28,8 | 51,5 52,7 
| 13 27,0] 41.85 2338,31 | 28,9 | 57:7 | 585 
10 S223 5 3630 8 1 TT 39,5 | 57-6 


8 a 
2 5 


= 
S > 
— 
uy 


Sata a-a 
\© 
2 
0 
N 


NY 


bud Zenith, Dintance of Capella. Eb © 
Point on the Landy 4 2 South. . 


*: 2 png —— 2 — * 4— & Dc 9 cath - * cy ER TT: 3 4 a a; — 


0 37,73| 10 29.0] 50 « 0 275 4 50 8,74 | 28,9 LEED 
* 9 428 9.344 FE 7.880 WEED S 
W_18 3883] 8 394] -.. 0,87]... _... 6487-1 28.7: 10 | 

W |8 39-52] - -8 42-54 2,98] 2,98 | 28,4 | 63,2 | 6ogt- 
E | 9 65,74] 8 53˙0 12,744 10,54 | 28,4 | 65,5" | 57 
W [ro 26,53 10 3, 41,87] 4.88 ] 28.8 78.0 52 
E | $ 48,20 8 31,5} 46, 70 16,73 | 28,7 72,0 74 
W 12 1 . „ 8,8 | 710 68, 5 
5 1 5 55 28,5 660 791 


= 
S 
A 
MN 
0 
* 
00 
wy 
— 
— 
* 


28 
— 
28 
1 
02 
wo 
dS 
00 
4 
— 
o 
9 


Mee at the Station near OY the 4 Erhemih of 
; the Arc, with the Zenith Sector. Jah and August, 1803. 


on the 29th of July, the observatory and zenith Sector were 
erected at the station, and the angle between the spindle of 
the weathercock on Laughton Spire and a staff at t Gringley on | 


the Hill, was FER, on different arches ofthe: 1 
the results bang; as follows, VIE, . 78 13 G2). 


" 4 
k Vp 4g 
* 7 
# *% y * 1 
% * I n 4 * 4 1 4 
2 8. * # 1 ty 13 E F- : 
* ' 'F LAS. :- $$. * * 3 as . 
"_ . - F * 
, * * * 1 n „ 1 bot eb tes > et was oth TD OO gre 
# 2 5 : * { 
[A 
8 3 | * 
. a? 
q 4 
} 


= a n artes it t has been 


A Ke, 


M 


N 


re e theodolit „ 


5 76˙ 17 2g" 80uth-east of the Werdau of Clifton; therefore, 


18 18 83“ — 


76˙ 


1 


7 23"==1* 567 8", is the bearing of Laug 


TY * 


ton Spire from that peridian, | The instrument, being otherwise ö 
_ adjusted for observation, was then brought into the plane of it, 1 
by setting off 1 36 8” on the azimuth circle; the permanency 
of the line of collimation of the lateral | telexcope having been 
previously ascertained. bh | | 


3 


75 F 


Ie) 
— 
. 


Oval, made at 0 qe, n to determine the Z enith Duane * 
B Draconis. 5 


Point on the Limb, 1 Cl South, 


2 


Daz of i Face of Plumb- - ERS FERC 2 Zenith 3 | ER cl Thermometer. 
the  jthe arch, line. 4 tion of | in revolutions reduced. ] ter. E 

month. E. or W | | the star. and parts. 5 | I Above. Below. 
„„ ,, de EF enn, Ji 
July zo} W {12 1,04 12 4.611 1 00 13, 7611 0 13.78 28.8 | 58,0 | 56,0 
2422 N | 7 $3133] 13 % 17½%% © 15,59 "28,7 | 54.0 | 5495 
26 E 13 27,55 13 6,8 20,75 20,78] 28,8 | 64,2 | 64,3 
28 W | 9 21,94| 9 32,3 - 10,36 10,38 | 28,8 | 59,5 | 58,5 
29 E | 9 3-13] 8 441 18,03] 18,06 | 28,8 | 56,5 | 57,5 

31] W | 9 34.59 9 441] 9,517 9,52 29,0 57,2 | 56.5 
Aug. 1 E | 8 36, oo. 8 18,5 17.50 17.53 | 2992 | 5995 57.2 
e e 100% 10,05 29,16 68,0 | 64,5. 
3 .Þ i] s 11,26 75 53. 81A 16,46 16,48 | 29.0 | 71,5 | 73-2. 
„ 14-84 7 57,9 15,94 | 15,96 | 28,9 65.1 65, 
12] E  Ji1 7,98] 10 50% 15,388 16,41 | 29,15} 58,1 | 58,0 
13]- W | 8 22,00] 8 30,4 8, 40 - 8,41 | 29,3 61,2 | 61,1 

f 195 EB IS 30,884 81,8 14.53 14.55 | 29-1 | 70,5 70 

| 150 W | 8 46,02 | 8 54,7 | | Hou 8,09 9 7 705K | 70,3. 


en 11 Diatanbe of: y Draconis. 


Punt on the Limb, 1-55 South. TOS 
. ve TR . — ure Tm 3 — — © —— 
Day of Face of Plumb. T's EAA Zenith Jiatance Zenith distance Barome- - 1 
- the {[thearch, line tion of | in revolutions: | * 323232 WY” OL EDO IG | „„ 
month * or W. py 3 ing the atar, 8 and parts. x Ne 5 = Above. Below. 1 
|. rev. div. rey. dir. „ rev. diy. 97 © 106 Inches. | ® | * 5 3 
| July20 W II 49,24 13 12,81 55 1 22,56 1 30 21,69 28,9 56,5 | 55,0 RE 
21] E | 7 23,81] 5 53.7 29,1 28,25 | 28,5 | 53,0 | 32,2 - | EO 
22 W | 7 34-31] 9 17,1}  * 21,79}  - 20,92 | 287 | 545 | 545 | Ee} '- 
23 E | 3 46,15| 2 18,9} 27,5 26,39 | 29,0 | 56,1 | 561 © 
„ 26 ] 9 3% 0 29,5] vo e ee 20, 16 | 28,8 | 64,0 | 64,0 . 5 | 
„ 56] 8 9/5 25,96] 25,11 | 28,8 | 56,2 | 57,3 | | EN 
29 W | 44,41] 10 4,5} 19,09 19,03 | 29,0 | 56,5 | $6.5 5 | „ 
Aug. 1 W | 8 41,22 "$0 $0 | 15” 20,78 19,91 29.2 59,5 | 57-0 | „ 7 
3E 9 7.59 7 40,3 26, 29 25,5 [29-1 68,0 | 64.5 ; 3 
5 E 7 50, 50 6 25, 23,0 245, 29, | 73,0 | 71,0 e 
7] W [| 9 738510 24,6 17,5 — 1618 | 28,9 | 64,2 | 65,2 
12] E |11 7,56| 9 42,7 23-86] 23,00-| 29.1 | 57,5 | 575 
13 W | 8 12,48 9 29, 16,92] 16,04 29,3 63,0 | 61,2 
17 E [8 10, 32 6 45.6 23,32 22,46 29,0 | 69,5 | 70,5 
18] W | N 14.65 1 28,8 | 70,0 | 70,1 


8 32,97 9 48,5 


Ou Zenith Distance aff; 45 F Draconie. 5 W I 
Point on the Limb, 3⁵ 25 North. 45 dd . 


* 
— 


— — F N e 
July 2 W | 7 35,91] 6 10, 53 25 1 25,41 3 25 ND os 23,7 54,0 | 53,0 
* --—=— <q - W488 36,67] 7 11,1 24235557 24,71 | 28,8 | 64,6 | 63,5 
29] W | 8 53.36 7 26,6 26,86 26,02 | 28,8 | 56,5 56,5 . 
31 E [13 3,53 14 51,0] 20, 19,629, 55. | 55,2 
Aug. 7] W | 8 47,0 7 18,6 28,900 28,04 | 28,9 | 65,0 | 64,0 
12] E [11 9,60 12 2/310), 21,0 . | 20,53. [.2942 | 5595 | 555 
13} W | 8-10,99] 6 38,9] 31.09 39,24 | 29,3 | 60,1 | 59,1 
: 10 E 8 14,53 9 38,9 oo Sort 23.51 29,0 | 71,0 | 59,5" © - 
as W.{8 15,031 6 41,3], . 32,73] 31,88 | 288 | — [680 
SEE 4" 
\ * 


4 ** 
1 * . 
3 ©. EE 


| "OY PAS” 1 
FEE * * - þ P 2 
þ * 
* : 


5 Obrerved Zenit Divtance i Ke C Draco. 


Point 0 on n the Lind, 1 5 35 North. 


I Face ** Observa- aN eee 
the {the arch, line, tion of | in revolutions = I ; 
month. E. or W. | | the star. and Parts. If „„ 
3 : 3 3 | rev. div. J rev. diy. |* 2 rev. div. 1. an p „ 5 4 
July 20 W 5 3 8 55,811 50 3 10, 20 1 53 7551 
2 W |7 2 9 21,411 55 1 2 e SS + 
„ , 50 8-1 9 2968| 7 31,3 37.38 3.43 
SN 2977] 7 3,7 37,7 774 
Aug. 4 E 1 55-40 3 8 54,80 6,ũ 
5 E 2 5 15,8 „ , 
++ F 6 37-64] 10 26,6] 47% * 12.8 
12 E - [11 3,15] 9 9,0 _ „ 75,66 
iz] W |8 6,41] 9 52, 456,09 14573 
7 B 8 25,75] 6 32,3] | 62,6 8,36 | 
79 vi 39-45] 10 07 © 45-05 15,78 | 4 
| Obamved Zenith Distance of 51 Dani 
Point on the Labs oO 200 Soutb. \ 
July 28] E | 9. 31,75 7 . 20 1 40,05 0 29 39-21 | 28,8 $5-0 [5.0 
310 E | 9 29,90] 7 48,5 40,4 39.6 29,0 | 55,0'| 555 
Avg. 5 E | 7 1171], 5 32-6} 33.4% Ane 193-0. 1 09-8 
, 37 f 10 19,5 29,86[ 28,95 | 28,9 [63,5 63.5 
W | 9 6,30 10 35,33 29,00 28,15 [ 28,9 66,5 | 65,5 
12 E 11 7,00 9 30, | 35-590] 3456 29,2 | 55,5 89 
134 W |8 1,71 9 29,5 27,79 26,93 | 29,3 | 60,2 | 591 
17 E 8 27,62 5 52,0} - 34-03. 33/7 29,0 | 79-1 | 70,2 
188 W 18 HO 3. 7 el = 9 1 28,8 [67,0 f 67,9 
| Obrerved Zenith Dae of =  Draconis BSD 
8 Point on the Limb, 1* 15 North. | 
—T — — — — — — NE — — 
w FE 10 9,3 I 15 1 42,57 1 16 41,73 . | 122.9 58,0 | 56,0 
9 11,90| 7 26,9 | . 44,00 43-17 28,8 | 58,2 | 58,5 
4 9 11,32 10 51,0 39,68 38,84 | 28,8 | 56,5 | 575 
ns 9 55-53] 8 10,0 45253 44.70 | 28,8 | 59,0 | 575 
Aug, 12 E 1 17,11 7 57.3 40, 19 39-25 | 29,15 59.2 65,2 
i | 6 35 48,981 48,16 ] 29,32] . | 8 
a: ; 


dan drvef the dau. 


Oles Zenith Distances of: 16 Sa 


| Paint on te Limb, o W „„ 
| og. of | — 1 1 Lend e Zenith aig [meme] Thermometer, 
the arch, line. | | tion of | in revolutions reduced. Er, 5 
month. * 1 the star. | RE Ss & 8 Ps TTY | Above. Below. 
ji 1 (3 div. | = 4 'xev. dv. y WT 1 n 
20% W. 962641} .6 37] er 329% 89, 
4 17,70 A #39] |. 1 51,98 e 79-1 | 79.1 
5 E Zenith Dixtances <1 1 * ene | 
Point on 9 1 _— 2* 25 North. 
2 — : * A 7 EE TEND. 2 ; — 
W Iz 45.26 4s 4 42,5 0 25 1 9 240 26 54 | 23; 56, 59% 
WY 12,00 Fi ² ⁰⁰ $0041 7 2241 28, 54,0 | 540 
W | 9 42,42| 11 39,1 55.68] -— 5487 | 28,8 | 64,5, | 63,5 
> | 9 29,47 7 27,2 2 2,27 27 0,47 | 28,8 EL 5572 
W 9 3.65 11 74 3-75 1,95 | 28,9 | 56,9 | 55,0 
W | 9 4353] 11 3723 1 52,77] 26 51,95 | 28,7 | 57,0 | 55,0 
E |9 30,7 7 28,8 2 2,27 27 o, % | 2910 | 55,0 | 55,0 
E |7 8,34] 5 9,1 I 58,24 57.43 | 29,0 | 71,2 | 69,2 
W | 8 46,45| 10 39,0] 51,55 50,73 28,9 | 63-3 | 63,3 
W IS 32,50 10 24,6 51, 10 50, 28 | 28,9 | 66,0 | 65,0 
E. [10-42,00] 8 4% 38,0 38219 | 29:2 | 5555: | 5955- 
W 18 11] 9 50, 49,79} 48,97 | 29,3 | 60,0 | 59,0 
E |8 25,55| 6 30, $4435 | $3-54 | 29,9 | 710 | 69,5 
15 8 27,85] 10 Pl ie, $51 =. WI | 28,8 | 66,0 | 66,0 
| Obverved Henith. Distances of 10 4 gui. 
Point o on the Limb, 2* 10 Hut. Fits 
— 15 | ———— 1 — — a — — — — if ; — — 
July 20] -W © 12 _ 2 10 1 24,07 2 8 36,79. | 28,9 | 56,5 | 55,0 
28] E | 9 22,60| 10 42,5 19,90 - 40,97 28,8 | 57,3 | 555 
e 38,5 „F 32,12 28,8 56,7 | 50,5 
30 W | 9 31,50] 8 4o| 27,50] 33,36 28,7 | 53,5 | 5755 
310 E 9 19,20 „ | ana: | 130 PIge 
Aug. I W | 9- 2:40] 7 341 27,30 33-98 | 29-3 | 59-3 1.57.2 
J E |7 0% 8 23,2 22, 0 38,36 | 29,0 | 68,5 | 68,5 
W | 8 50,33] 7 215 28,83 34,02 | 28,9 | 62,2 | 63,2 
W | 8 47,48] 7 18,0 29,48 31,37 | 28,9 | 65,5 | 66,5 
12] E 10 37,36| 12 1,0 222,644 38,22 | 29,2 | 55,0 | 59,0 
iz] E | 8 21,50 9 47,0] 236,80 35,36 29,0 | 61,9 | 68,9 
„ * 8 29,25] 5 54,7 33,55 27-39 28,8 66,0 | 66,0 
| Ri wk ws Ne We * 


1 85 . : . | £ 
) Co ao EE Point on the Limb, P 20 North. a | 
0 | Ploinb- 4 e 3 distance Zenith . „ e Thermometer.” 
7 nine. tion of | in revolutions |. . ter. 

Ss month, E. or W. Ĩs the star- ; and parts. 1 1 Above. | Below, 
. 1 ji Irs iv. rev. diy. o 7 0 div. * wy L Tackes = „ 

: | Aug. 17] E 8 58,45 8 IP at 1 55 19,45]. 1 20 d 10,42 | 3993. 1 83,6 

p obe Zenith Die of n Une. 13 
Point. on the Limb, 3 5 South. „ 

— ad | - * 5 . a 2 1 5 * vg 


9 1,35 13 $,0 3 5 4 3.65 3 9 ,o | 29,0 | 62,5 | 62,5 =, 
26,0 13 30,9 4590 1,30 | 28,9 | 78,0 78, 2 
40, 50 12 46,0] 5-50] „ 29,2 | 793 79,5 

7 34,74] 3 22,0 17,744 9,15 | 29,0 | 76,0 | 73,0 
% .4 38,5 ns ee 7 94 fan 


= 8 „„ WSN 2 | Obcerved Zenith . Pintences of 4 Une. 
= ah PE CHA 6 Point on the Hund, 20 . Nortb. 


2 ”» * * 3 . 
* 3 ——— K 4 —_— — 
"YM FRAY 
— 


* 8 FP 


* ; bh. 
* | 8 
— . 


ms 29] . E. | 9: 3,82 "00 21,5 2 30 0 12,58 2 30 12,70. | 28,8 69,0 | 65,5 
* 5] W 3 49-97 | 8 22, 18,47] _. 18,50 | 29,1 | 79,5 | 78,0 
8 E348 25167 8:237;0þ dg 11,87 | 29,0 | 69,0 | 65,5 
W | 8 49,00| 8 29,4 14,60] © 2 | 28,9 | 80,0 | 80,0 
E ig 19,43 | SE N au : . 1 29. | 9 80,1 


| 7 
- 


* 


1 > e Obama Zenitb ee * 85 Handi. a 5 Ge 
A . 44 Point on the Limb, 7 20 ' South.” | 


| 


{ 0 
E. > * = 1 * 


_ _ 5 0 be : N 


11 8 12 6, 0% a o 4 | 7 20 14774 . 28,9 5.3 8.5 
3 50% 1 28, 11,7 21,6 %%% % 8 
9 30, 92 14 47,4 15 5 16,48 „12.00 28,8 | 56,0 | 57,0-. 
10 15,40 10 26,5 20 0 11,10| 11,12 29,0 | 57,1 | 56,2. 
9 6, 18 9 17,0] _ $5 10,82 T1 10, 84 29,2 59,5 5752 
8 2,52} 7 42,0[ 19,52 19,75 29,0 73-0 | 71,0 

9 17,54 9 29,0] 11,46 11,48 | 28,9 | 67,2 | 

18 * 7 56,04 18,52 18,55 | 2950 | 70,5 Þ 712 


w 8 
O 


- 


3 
——_— 


* Observed Zenith Dictonces 4 v | Hereals, 
| Point on the” Limb, 6 5⁰ South. 8 
n 5 Zenith distance PE "Re EE 3 Thermometer. 
line. tion of | in revolutions reduced. - ter. by: 
I we star. and parts. I Above. Below. 
— — —ͤͤ ꝛ —— — — —ͤ ͤ —h— — 
; 12 div. -| rev. div.] rev. div. lache. 
8 1,5 ][ 6 16,65 50 1537-|6 51 52,89 | 285+ | 55,5 | 5455 
” 9 44ky 2 17.0]: -.- 56,1 55.29 | 28,8 | 60,7 | 61,5 
eee 4661 460 W 5 47-17 | 28,8 | 62,5 60, 
| Oberved Zenith Distances o 52 Herculis. 
Point on te Lib, 7˙5 Soul. 12 
July 28] W 8 105 11 15,5 pov 2 16,78 7 7714,00 | 28,8 | 58,5 | 58,5 
29] E [| 9 11,35] 6 47,0 23,35 221,58 28,8 | 59,7 | 59,5 
30 W {10 1,29] 12 16,0 : 5 12,93 | 28,8 | 61,0 | 59-0 
Aug. 8] E 8 8 TO 23-91 26,80 | 25,04 | 28,9 | 65,2 | 05,5 
| Obverved Zenith Distances of 22 1 Hal. 
: | Point on the Limb, 6 46 | > South. mo 
TE. ifs a 3 1 * . 6 39 1 28,860, 615,5 
W IS 8,81] 7 58.6 e 50,77 | 28,8 | 62,5 | 60,0 
W |-8 5, 20 7 53,0 11,10 48,88 | 29,2 | 67,0 | 67,0 
NX 10 173] 9 30,5 „ 28,9 | 71,0 | 69,0 
W 10 16,30 10 4,0 132,50 47,48 | 29,2 | | 65,2 63,3 
E |8 12,30| 8 168] 4,30 e 29.3 67,3 65,5 
Observed Zenith Distances of a Persei T 
Paint: on. the Limb, 4 20 Soutb. 
eee rr nboy roar 
19 * 14 4547 4 20 1 al 4 18 39,91 | 28,9 | 66,5 | 63,0 
| 3 38,84] 7 18,0 20,84 40,03 | 28,9 | 70,2-| 71,0 
10 27,76 11 4526} 1,844 _- 43-93 | 29:3 37, 540 
8 26,58] 9 435 16,92] 43-95 | 29,0 | 60,2 | bo,z 
| 8 11,42] 6 4795} 22,92] 37,94 | 28,8 | 60,5 | 60,3 


- 


\ 


— 


[Od Zenith. Distances dof Capella, 
Point on the bs Bis 28 South, ; 5 ; 
5 A * 7 7 | 28 | ; | | —— 
Day of Face of Plumb- Düse 5 Zenith distance Zenich diatance ans fare 6 : 
| line. | tion of in ae pu - reduced, 17 Wy 
month, E. 8 the star. apd parts, | E Below. 
F ee ee ee 
Aug, 7] W.|g 7.20 '9 36,0ſ7 40 0 28,80| 7 0 22.85, 28, 66.0 
38 E 9 23 8 25.7 38,583 38,89 28.9 1 
9 E | 6 28,62 {5 48,0] 309.62 39 5828.9 74-5 
18] W 2 145] 9 269] 25,45] . 25,49 | 29,0 68,0 
18 E ” 8 3,80 7 28,0 34-80 1 34-80 | 1 


The 


Operations at the new Se- on 1 Hill, near 88 R 
with the Zenith e in the Months of . age] 


October, 1802. 85 A. | 
1n the Phil. Trans. for ioc page 656, it will be seen, that 


the bearing of the Summer House on Bardon Hil, in the north 
of Leicestershire, from the meridian of Arbury Hill, is 7* g7' g1” 

NW; and, as this spot is only 2776 feet westward from. the 
meridian of Dunnose itself, it follows, that 7 95 g1” may be 
taken for the bearing of the above object from Arbury Hill. To 


avoid, however, the possibility of any error arising from adopting 


this supposition, the direction of the meridian was ascertained, 
(before the zenith sector was got up,) by a double azimuth of 
the pole star. From this it appeared, that the angular point of 
the roof of a house about seven miles distant, was within a few 
seconds of the true northern direction ; and also, that Bardon 


Hill (the summer house) was 7 37 Yu narth-west. By ob- 


_  serving these two objects, as the weather suited, the sector was 
afterwards got into mms: of the — 7 


| Point on n the Limb, oo 0 16 Norib. 


tlance of g Draconis. 


Obcervations made « on cots Hilt FR the Zenith Dis- 


% . : * . we 7 
ä 9 — * 1 
. - ” PX * * * i 
« % 4 - | ” * * 
4 4 J : 
$644 * a a - 5 
* 3 
: . _ Ky LS 
4 o + 2 8 ; "% : . 
* F a . ; * i” 
4 * ) i: * 1 2 % 8 
4 - s 3 
> 5 « : 4 4 
: Reg ; ? « N . : | BR ; OE, * 
4 2 - i * 15 — s 4 > * 4 p C x "i "vw X r jos J I s 
+ : l * — 2 , 7 * N « 3 r 4 BP TT I; 02 TT” 2 2 * 4 
. » 7 F 88 F TOTES 8 SA Rn 8 n L WIE — 8 1 UNS 8 N 
3 r — — 5 — — i ee — a — — — 6 ——— — - 
, , GS Oni EEE A CADA bas rs _— 


— — — ä b 
Face of . 5 FOE, ay” a0 Tenith dintance — Thermometer. 
the arch,] line. { tion of | in revolutions reduced. ter. ; 
| E. or W.“ the star. and parts. $4 I Above. Below, 
—— 33 2 —ÄEä2ÄEꝑ con 3 25 
i | rev. div. | rev. div. |? rev. diy. Inches, | * | *' 
W 98,90 10 78˙7 oO 15 1 5.80 © TS $5.09 28,2. | 51,0 | 54,0 
E 9 7.55 426,3 11,48 49.45 28,8 | 70,5 | 72,5 
W 9 17.78 10 23,0| 5722 95 28,8 | 71,5 | 76,5 
E 9 16,33] 8 6,5 9,83 950 28,8 | 68,2 | 69,0 
E | 9 26,17] 8 16,0 10,17 30, 71] 28,8 79-3 | 757 
W | 8 21,00 9 25,0 4,00 56,89 | 28,9 | 76,5 | 76,5 
KE 9 7,68] 7 57,0 9,68 51,21 | 28,9 | 71,0 | 70,5 
W | 9 29-13] 10 34,0 47,87 56,02 29.1 74,8755 
E. 9 4-27] 7 $1.8 11,47] 49-41. | £9,0 | 045 | 66,5 
W 10 43,25 11 48,7 5.455 55545 | 290 | 655 | 65,5 
E 9 27,65] 8 17,3 10,35] 30,53 | 29,1 | 79.0 | 77,5 
W | 9 25,82| 10 30,7 4,88] 56, o4 | 29,0 | 64,0 69,5 
E | 9 43-20] 8 31,0 12,20 48,79 | 29,0 | 72,2 71,5 
W [| 9 19,02] 10 26,6 7.58 53,31 | 28,7 J 740 | 73,0 
15 Ro | 
Ohe ed Zenith Dictances of 7 Dracont is, 
Ss Point on 925 Limb, o 40 South. 
* 2 | Ef. 
| Sept W ; 53-85 | 11 oo! 40 2 11,55| o 42 9.76 28,2 | 51,5 | 54,0 
E 8 47,75] 6 319 15,85 8 0 28,53] 48,2 | 55.0 
E. | 9 46.65] 7 28,7 17,95 16,17 | 28,8 | 70,3 | 72,3 
W 49 7 11 8 12,50 1054 28,8 | 67,5 |} 735 
V Dd. 44.81  --- 1,98 16,20 | 28,8 | 68,3 | 71,4 
c _ --17:381- 15,54 | 28,8 | 79,8 | 758 
W 18 9-97 10 — 10, 53 8,74 | 28,8 | 67,5 | 65,3 
E | 9 16,97] 7 o,8 16,17 14-39 28,9 | 70,5 | 70,2 
78 W | 9 16,00] 11 27,6 11,60] 9,81 | 29,1 | 74,0 | 75,2 
25 W 9 10,Ü 47 11 23, o 12,53 10,75 | 29,0 | 59,5 | 642 
TTT 16,70 14,92 29,1 | 64,0 | 69,5 
ä W | 9 21,63] 11 33,5 "381; 87 10,08 | 29,9 | 64,0 | 69,5 
Oct. 1 E | 9 34.95] 7 1555] 199445] 1,87 28,9 | 72,5 | 71,9 
Rp, bo 3 9 25933 „ 7. 7,04 18,33 16,57 | 28,8 | 71,0 | 75,0 
1 W | * 11 7,1 11,801! 10,01 28,6 74,0 73.0 


N 1 
4 , _ 2 — +. "I 5 x \ 8 2 F4 > 
DPdP w —ꝛ—— — 


Oben Zenith Distances of 43 1 Drasi, 


Observed Zenith Dicks o 46 C Draco. 2s 


_ Point on the Limb, 8 5 North. 


Point on the Lind. LY * North.” . 
Day of | Face of Plumb- Obeerck Zenith 3 Zenith 8 8 "Thermometer. 
the the arch, line. | tion of in revglutions | reduced, } ter. 72 "og 
month. E. or WA _ the star. 7 ang parts, E Above. Below. 
Ip 1585 rer. div. | rev. div. o 9 7. 
e „ 22.5802 f 9 39,47 4 40 38,53 28,2 52, 540 
is] 7 29,48} 6 22 40,98 41,06 28,9 63,5 360 
8]. K. {1 9 45.55 10 18,6 32,05 32, 10 28,8 = 67,2 
19] W | 9 28;10 9 46, 40, 30 40,57 | 28,8 „5 | 72,5 
20 E IS 56,23 9 29,1 31,87 31,92 | 28,8 | 66,5 | 69,5 
23 W | 3 0,83] 7 22,4 3743 37-49 | 28,8 | 67,5 | 65,5 
24] E 9 18,78] 9 50,44 31,62 31,67 | 28,9 | 65,5 63.5 
25] W | 9 36,25 8 57,1] 38,15 38,21 | 29,0 | 65,3 | 67,3 
26] E | 9 14,12 9 46,5 32,37 32,42 29, | 64;8 | 66, 5 
28 E | 9 18,62 9 50,0 31,38 31,4329, | 65,3 | 04,5 
29 W | B 57,55| 8 2% 37555 37.61 | 29,1 | 645 | 69,0 
36 - W | $ 51,62].;8 1395] zi, -. $18] 200: | bj.3 199.8 
Oct. 1 E | 9 25,05| 14 58,7] 3365 . 29,20 | 289 | 74,0 | lg 


Sept. 7] E 9 RY 11 19,23 3s 5 5 2 15740 3 4 mY | 
100 E [9 3731 194. 2 15,67 13,89 
15} W | 7 30,08] 5 6.5 23.68 241,85 
26] W 'ho 1% 7 % % - 2480] 24% 

: 28]: BE: '} 9f290,12)t 4704 7 1 BB8[-: x60: 

19]. W 9 49-57] 7 16,3] 24,27 22,51 
20 E | 8 34,2710 52,3 - 18,03 16, 26 
21 W | 9 55,90] 7 29,0 26,90% „%% 
22 E F % 378 15,95 
23 W | 9g 20,01] 6 45, 24. 10 „ 
24 E [9 3.9711 „ 334 16,56 2 
2 W | 9 42,55 7 19,2 '| 23,35 2158 2 
es ene eee, © 4 15,90} ren, 
28 E 9 17,8211 35,0 17,48 15,7029, 
9 9 3. 00e 7 48,4 } 23,00[ 21,83 
30[ W 9 4.20] 6 38,8 = + Shad 2264 

Oct. 1 E 9 16,65½ 1 36,1 } 17,45] 15.67 

IP, | "W's | 9 1 by 41,1 52 18775 25 Wir 


3 


is 
[> 


a. 


* 


HERS —_ — „ 


* 4 
3 


d SSS 


fat 


wWwHNNNNNDND 


= 2 hog.” " 


1 8 50,82 


1-9. 31,90; 


N 


— TION e 


= 


ry 


6. $4.98] 
8 52:47]. 
10- 31,57} 
8 21,80}. 
9:37:93). 
8 24,05} 


4 56, 10 

832,57 
9 44.57 
9 20,58 


© 38, o 
9 48,10 


- th. 


6 — 


— A 2 


* 


the «tar. 


Zenith — 2. 
in revolutions 
and parts. 


W 


rev. div. 


38,0 


—. 


10 38,0 
7 * ＋ 
15 43:6 

11 9˙0 


10 48,5 
6 2395 
11 47.7 


7 249 
11 20,0 


7 35.0 


9 2,82 


11 38,0 


— # 


72 . 65 py a — 3 - 
* of „ {> 83 
A 7 4 > SC. » LY) 


. / rev. div. . be tt 
30 25-2: $47 32.4810; 
at bt | 
20,92], . 
22,57 * 
16, 20 


40 5 19,55 


| 45 2 17,18 j PO 


4 42 
r 

* 
1 


31S] 
8 9,0 


15-42 
23-00] 
23,20 
16, 58 

75 d 


2 8 * * 
1 N = 
N 
3 "4 I — I 35 k z 
1 : 


2253 


22, 60 


15,98 ö 


21,07 


Obere Zenith Disfances of 51 Draconis. 


Paint on the Linb, o. 50 North. 


"2 


I 


: . * . 


„ 
. * 1 
* + 
c 4 
9 


* 
tn Wat 8 


7 


f 


/ ? 4 
— — — 
8 * 
3 IA 


* Sf , a 
* „% 


4 


4 


* 


2 3.8 
6 41,63 
9 16, oc 


42,0 


9 565,31 


26.10 


8 — 
— 


155 0 
11 53.7 


11 19,7 
1 


. 


16 57, 


6 51,0 


5 Af is 
4 


We 1350 at 
.9.. 453]. 6 21, 2 


171 12 1,44 
138 7531. 
53-9] 


| 11 49;o| 3 
* 24 


* 


I 


$5 2 nt] 


50 2 49-13 


W * 7 „1 FT x 


"I 


37:70 


1: 42-50 R 


5 . 36,70 


43413} 


35.90 
35.9 
41,63]. 


42,3 
36,23] 


36,13 
40,95 


5 2. 75 


30,78 


* 


% 52 1% 
38.39 
Frog 


n 
n 


5 


40, 


3495 
4 
34•˙15 


34637 | 


39. 89 | 
1 


34-49. 
. 34239: 
> 39421 1 
4, 10 


— 


*% 


| Obrerved Zenith Distances of 1 7 bn. 
Point on the Limb, £ 35' North, 


Bs : 
| Zenith Distance of 10 
. Ton“ onthe ' Limb, of . South. 
Day of | Face of k my 1 PROT Zeiitth Uintagee * 1: 
the {the arch, line. "tion of | ia revolutions | red 
month, E. or W] I the star. and parts. 85 
5 0 v. div. fer. div. er. ' Hr. F ID SUS Pa} 
Sept, 18| E 18 8 19917 8 53,0 85 0 3443 285 Rat | — 
19 W 2 37,.65]9 %% 35˙% 2,½ |28,8 | 
20] E 83 31,879 75. | © 34-03] | 25-31 | "28,8 | 6 
21] W 10 16,65 9 35-3 [40,35 5 19,58 28,8 
22 E 8 51,59 9 28,2 ON - 35-01] '''- 24,33 28,8 
233 18 7205 s 105 1 38,75] * 2119 | 28,8: 
24 E | 8 22,08] 8 56,.8ĩ "| 33.91 © 26,02 28,85 
25 W | 9 4592]'g 7.0 38,922 ' 21,02 | 29,0 | 66 
26 E 2 11,63 N 34,77 25,7 | 29,0 | 
27] W 8 57,08 134 |  4400| 19.93 | 29,0 
28 E |8 654.839 3, 35927] _ N 29,0 
29 NW Y $90 9 12,0 | 480,90 19,03 | 2950 || 
300 W 5 $3-38[9 11,3] 42,08 17.85 29% 
Oct. E 9 10,95 9 47,0 | 36,05 23-89 28,9 
x b 8 po | | I 2 «3 1; 36,124 mr 28,8 


Ones Zenith. Distances _ 1 Une. ; 
Pont on the Limb, 1 55 South. A 


Sept. 18] E 2 3247 7 35 b 56,37 „ 34 3,33 28,3 
23 W 8 20,0% 9 20,1 |2 35 © C171 _ 2,87 | 28,9 ] 8 

26 W 9 22,0 10 18,5 54,80 5,10 | 29,1 | 8 

Oct t$1% B | JGG45 | 8 25 7 33 5% 1287 | 7 


ue; 100 w I 8 16 6.58 3 5 5 0 7,82 1 55 „ T; 
„ 9 26,02] 9 1349 | 12,12 12,4 
„ 1 „ e, 5 ok, 
„ $ 21:49 > 33-5 12,0% , 12,12, 
* [1009 2-35 | "> 1803) e 
E ſio 5,25|9 47-7 16,5 16,57 29-1 | 7 
W [10 5,1210 15,0 | ' 8,88] * 8,89 
Oct, E 1 9 27,63 50 972 | 3 18,43 18,46 | 


17 - « 1 * 3 1 ut = +: i . 83 * — F 4 
YT 8 * ( 1 * * *% " 5 4 * : 6 8 % 7 4 * vt 7 OS is 0%. . 9 88 6 . 
4 2A , * * 8 Ids 3 4 * ; 2 72 I 5 . . 4 4] | * *. 9 Sax F * 4 * I 7 J 7 4 7 2 þ 


; 2 Zinith Dickancts' 'of 8 Dre J nM 1 
omg ab | Point on the Limb, 4 45 North. , _— 


s 2 4 8 * Nc A L a. 
_ . — 2 
ie. * 4% * . IF 


| ht | Zonkb 1 Zenith distance = Thermometer. 
* revolutions reduced. 8 1 5 
aud Parts f Above. Below. 


bet. Face of 
the ithe 4. 7 
month. E. or W. 


1 0 


9 
ev. dv... "Finches. | | * - | „ 
13 45 © 55,50 | 

51,55 | | | | b 
The 1 0.72 gn Þ 0, 18 29,0 8 5 76,0 | ' + 
ein ie | 43 $9.80 | 


£ P 

e * 2 . 7 
* 4 J r 8 * %*; 
* 4 % IE Ie * \ TEE. 7 . : 
* * ; 
* * * — 

J * * 5 
* * 1 n * 
' a oo 
ao * 6 " 

{ — „ 


Observed Zenith Distances of + 22 2 - Hereuls, 8 . „ 1 
2285 Point on the __—_ 81 85 South... 1 | 


JD 


Sept. 18} E 9 50,42 8 52,5 Is 25 « 0 56,92 
Oct. 3} W. 1 33-10 | 1% 


— 
1 y 
- er-. = ax 4 P * 
—— f — TIED e ͥ ! % (Ä — 


5 *; 57,01 | 28,8 725 
5 50, 48 * 76,5 * 


2 


oe | Obcerved Zenith Distances of 4 Pere. 1 „ | | 
Point o on the Limb, Cy 551 South. TA ; 


** 
_ 
—_ . K — a a 
"x 3 1 ©. ; 


7 35-23] 8 0.6 | ; rr 0 23,37 3 's + 3659 28,8 | 41,0 | 44-0 0 
8 29,27| 8 52,5 23,234 36,73 28,8 | 415 | 4445 | 
9 17,50] 8 47,9 28,60] 31,35 | 28,9 | 5527. 5745 8 | 
19 53-32] 9 25-35 | 28,22) 31,73 | 28.8 | 57,2 | 535" 3 
1 8 1 8 23-13} > 8 36.83 | 28,8 $35 58,0 _ 55 | 4 
[7 4473] 8 9.3 | 23-57] 36-39 | 28,8 | 58,0 | 62,0 i 5 
8 58,00 8 27,4 30, 0 29.85 28,7 00,0 60, o | 

219 23,7 24-28 35-67 | 29,0 | 49-5 | 53-5 
ol 9 19,8 29,30} 30,65 | 291 | $525 | 54-3 


** 


eee e 
II 
wa 
Ka 
G© 
%J 
— 
O 


Ms 


; Po 80 18 a "y , PR ONO FTI oa I * "0 88 *Y 
\ 7 * En - — 
x @ 4 N 8 
dee on «the my i : 
hy | eg of aca $a a] ea ere Zenith distance B 
5 the arch, line. tion of, | in revolutions | reduced. | te 
, or W. * ' . 12 F: — © i — 5 I 
. c rey. c. frev. "Hy „rey. div. | | fac 
: E | 9 47477 8 15,9 6 25 1 34% s 5 33.02 | 
E EI 45-37} 2-325b % , 
w 7457 % gr 2,83 257 1288 
9 „od 20%ĩę | | 27,80}: 26,94 | 289 
E |9 24-77] 7 488 | | 3497] 3412 | 28,9 
\ W | $# 10,88 9 38,0 | 27,52 26,66 38,9. 
| E 4, 0 7 15,2 33.00 32,18 | 28,8. 

; W | 8-16,97] 9 4555 | 28,53] 2767 | 28,8 
E 2 6,93] 7 340 | 31593] 31,08 | 28,8 

W | 8 48,5010 16,2 26, 70 25,84 | 29,7 

. E |8 53,40 7 20,0 ʒ bö0 33-39] 32,45 29,0 | 
| „ 9 55551 18,6 28,08] 27,22 29,1 


= N 85 Gee Zenith Ditarces o 2 Draconis. - 
„ EN | 3 Point o on the Limb, & 55 North. 


= VV duc Zenith Distances of - 7 Draconis 1 
1 Pot on the Link, 05 df North, | 


Oo 


oy a * * 0 * * 
I — ad LOS 2 6 kbetÞ<4 e 275 — 2 1 == 2 gt * n 


Day ot e e > 5 1 
: 4 tion of in bevolsti8 e 
| of W. the atar, | ant parts. 
0 ny —— — — . 
mY | Ne „dir. rev. * | 
Apritig| W 4 38,7 4 4655 26 4 81 
23 E 18 2777 13 6,0 4 | 1332 
e 9 47520] n 927 
"es  Observed Zenith Distance of 46 C Draconis. 
© Point on the Limb, F 30% North, | - 
Aprilis] W. Ig 15,70] 7 419. ls 57 3195. 1.005 5 
DdDdserde Zenith Distance 51 Dravonts. we 
Point on the Limb, 1* yy North. - 
31,1 $83 
30, 1 38 
: 4 9, ou 1 2 11 
HD Obere Zenith Dil of x 1 * oed 35 
5 „„ 5 
. Point on the Limb, 15 30 Nortb. 
April 23 E | 9 20,36 10 42,8 |1 30 1 22,44 1 33-2653 30,1 38 
- 25] W IS 29,76 6 58,6 { 30, 1 29,31 | 29,5 $1 
| e Obeerved Zenitb Distance of 10 Cygni. 
Point on the Limb, of 10' South. 
April i 1 11 32,42 11 42:6 | 10 0 10,18] 0 10 10,19 
We 1 9 36,12 1838,42] 18,45 f 


8 


by N 6 en ' " a 6 * l T F hy M " oy 
* 1 : og 4 2 | : . A A — 2 ö 
y p 5 a g - 8 - * 7 SIS : | 
L ; . ny Fl e 8 j 'D N * 
"WF. 2 FIN 8 . 8 73 3 
: 0 k : | | 
3 g 5 
* * o \ F % 
| | v6 An Accou of the 1 
nh ed, Zenith Distance of 7 Une. ö 1 
* 7 / % 
Point en the Linb, g 15 No #06 
Day 3 | I of Plumb- ; n Zenith IRS, Zenith as Barometer. Thermo- 
the ſche arch, line. | tion of, | in revolutions | rectified, |. _. | meter, 
month. Z. or W. i thestar, | and parts.. I Above, | Below. 
„ — — Ba nmr — 
* 


div. |rev. dv. rey. dir.. lache. 

3012 42,7 |3 15 3 38,40 3 18.55,79 29,99 ũ ᷑U50 
/ ANTS -30 
29%] _ O75. '- $714. 4 30011 -. 48 
25,1 | 11,80] 19 8,21 | fo. 1 0 


4 — 


: Ob served Zenith Distance 3 . 


. ff.. eel”, Point on the Limb, 1 10' South. 
py Ä f April = w Tos 13,90 [10 40,7 1 10 © 26,80| 1 10 6 : . | 4 FL 
| — 3 37-50 3.46 |. 32, © 32:45 | 30:1 3 
„ | Objerved Zenith Dietence of 85 + Heres Te 
5 33ͤ;;l re FOE”; Point on the Limb, 7 20 South, 
3 | OO hprilus| W | RE 4729 |s 0 0 4631] 5 20 46-39 | 29.0 | 40. 
e 19 W | 9 49,30|10 3% 39,26 39.26 | 31,3 5 
a3] E 19 2,169 235 | - Yon 56,75 1 30,1 J 3 


1 = x 
* | A AS a 7) 4 
"Os * 
* 4 4 


Table nnn 1. Runs of the MMicrometerchorany over every 


the 10 rot 5 on each Side 7 


igbt Hand Arc. | 


5| 

5 

5 

5 
Ll. * 5 | 
. . 
pres 

21” 5 


13 2 — 


* A 
4 f ® 
» * 1 . > 
8 — ; 
2 7 , 4 7. | 
. 7 1 . 
5 . — - : by” * 
p g « \ 25 — b 4 — 8 - 4 
l 0 — 8 Pp * 2 Fr 2 
a - ö 5 . & PI 4 > * * 8 n 2 8 . * 
2 2 8 A 8 —— RE, 6. OE es COD UE 
: 2 os 1 288 A 7 8 * * 4 4 1 
JOS. FO " wa. Na” F D * 8 
* — — _ \ - \ 1 3 — On - = - 
RT ON I TS , Ae AURA oY a — — 
- — —— ñ— — — 


I 
w--- ——— ˙ A a w—w_——_—__—_ - 


Table for converting the Divisions thewn on the Micrometer Head - - 


- 


into Seconds; the Space subtended by 5 on the Limb being 


d = 5 Revolutions 43 EY 4 


% 
* 


| Surement of the Fatal Haber. e e 
a rata ———————— 
rs R. R. D | . i 
5 — | 289198989. 
of 4013,02 2 
a 8 N oe N | 
CE 0 | 0 ; 
. O o 
0 140 R | 
„ 02 
0111 11,018 A 0 
oft 12,929 | 0 | 
: 041 313.092 | 49 be 
0114 | 14,029 s lo 4m 
| ©415[1 | o | 
} 5,023 | |. 
|, 01 6 6 E | 9 3 8 
ofrzþ7,09 40 8 
| on N 5 | 
2 0 19 19,032 40 be 
__ ©|20P20,099 | 1 
eee . 18 « IR 
o 22ʃ22,037 1 5 
© 223,038 E 4 wh 
; © [24(24,,04,0 | | E 
9252 3,042 x0 
|  oſ26ſ26,04g| 1 
: O [27 27,045 10 
o 8 28,047 0 
1 29,043 | ©. 


a— 


4 Star, on account of the 
Eibe $ectorial Tube by 1 of He 


7 _— AWE_Mp_—C”_____ _ _—— TT —— — 
> Zenith a Correction "= = Zenith Correction Wo 
distance . distance for N 

observed. 12 of heat. 5 f obserred. 17 of heat. 
1 —| 008 | 430 — %%8 g 
130 — 0,028 | 5 — | 00998 _ 
2 — | 0097 | 135 JO O, 102 By 
. 2g0—| 0046 | [6 — 0,111 
3 — | 0,056 | 6 30 — | 0,121 
30 — , 65 KA, — | 190. | 


4 
* 4 
* . 
Hy * * . 
; 2 — 


. 
« 


f In using the above Table, the corrections are to be taken as 
negative, if the upper thermometer denotes the air to be hotter 


* 


towards the top of the observatory than round the limb of the 


sector; and positive, if the reverse. "e226 god. . "0 


* 
8 "” 
* i 7 4 - 
% ; 
” T 
oE * 
ö : * 
— - 
Ld = . 
* * 7 
* aj 
4 
* * d 
4 
. — 
- 4 
N * 
— 3 - 
4 p 9 ED 4 
be U 
0 
a * 
4 7 > 
* . 
# 
— 1 » 
os i - * 
& 478 N 1 - \ 
0 * - . — 
— : " 
* 8 4 — — 4 
: 
5 * 
i * " 2 We 
-_ 
- . 
% ” * 1 
* 3 * 
* * - 
* 
— 8 . 
os oF 
— * 
— 
in — 
* 
% 
* 
- 
.* , 
% 
* 
„ * * 
- 7 » 
> — — 
- a — = 
» * 
. 
4 , 
bs . 
+ 
. 
- - 
* 
. 
I - 
* 
4 — 
* 
— 
* 
1 2 ol 
4: * 
* — „ 
— 
” d 04 - 
4 PS 
S340 _ = oy 


* 


IE” 5 
—_ 5 — 
— ,, , «. —§———— an 

— Bags ws — 


CEO 


— mam „%% 9 NS 


— . —— ns 1 ot 
— ] A 7⁰.ing ͤm ! kü . ˙ ß + 4 


f — rae no nr 


0 x 2— —ů 


— PR 
— 


. 


— UII A, a 


wy 


— 


—— 2 — 


* * X 
7 
, g 
5 : 2 * 
* T + 455 * > C * 4 : ; » 
b - 


Reduction of the — W con N in the * Artiele, 1 
the respective Days on which they were made, to the first of January, 1802; 
the Equations being tbose far Aberration, Nutation, Semi- annual solar Eqi | 
Precession, aud Refraction ; with 158 Zenith Distances of the. ura Stars 
deduced — Wk! iz a | 


4p 41 ; 


e Reduction * the Observations made at Dunnose. Es 
| 1 Draconis, N. „ 5 
Face of limb, West. rTuace of limb, Fn + 44 ng | 
May 11—1* I 7,65 May 13—1* 500 of 3 Zenith dis. 1 500 1 
ts 7, 16 1,10 | +1,83 Mean Bb. „ 
june 5 6,11 june din | Do, of Temperature. 
os „ 3 10 Expansion of axis. 
#8 VVV Menn zen. Pg 1 50 524. 
14 587 doi Line of collunation: 342. ; 
17 6,32 2198 149 2 | ES 
2 7 
| Mean 1 * 6,88 e 1 . oP; 
97 Draconis, N. 
May 1 54 8 May 10=0* 57 51,66 Zenith Go. oꝛ 53 55" "-1 
14 0, 12 13 . + 0391 Refraction, 
June 11 33 59-45 e WY e — 0,02 Temperature. 
1 | £1,005. OF TH WCODITTION HT 10 Lo OAT Hr of axis. - 
14 69.14 June 132 51,53 Mean zen. dist, o 53 36, 63. SOR 
17 $9.44 - 17 33.58 Line of collimation Kong . | ; 
2 o {$793 451} #4 OL <1 aa Rs oy eres 
Mean © 53 59,39 Mean o Hl ns | 
| * 45 1 N. 
| June 1 4-—6® 16' 45%,24 " Junk 1 6 16 36% 66 Zenith dist. 6* 160 41%,70 
18 +: 47648 r + 6,29 Reaction. 


„„ 20 3 ' — 0,21 Temperature. 
| | 8 and 37 oy | | — 0,12 en of axis. ; 


Mean 6 16 46,21 - 15 Mean 16 37-29 Mean zen, dist.6 16 ed | 2 
| Line of collimation 4-46. p 


46 0 Draconis, N. 


| June Hs 43 294 4 June 131 43 20",76 Zenith dist. 4 43! 24 9,42 +471 (refr bed 43 15 9 3 
16 19,99 Line of collimation 3 41. 5 
2 are . 28 22,18 | | | 
Mean 4 43 — Mean 4 43 20,98 


111 


June 1 28 4862 
44-85 
21 - 4435 


Mean 2 28 45>11 


May 11-4 7 1 * 


14 6 $763 
June 14 5913 
GT © 

" WM." - © FRIS 


May 2 34.99 


: 34-17 

OM. 3 
June 11 34,25 
14 3426 

wy ' 34431 


Mean 2 2 34-21 - 


Jane TP” 23 1 
18 23.20 


Mean 2 23 24,38 


June 14—O 41 43,52. 
* 43-53 


$12. =: 44400; 
Mean o 41 43,24 


| May — 10 1 47 
„„ IS - 
June 5 36,55 
„ 
„„ 34-80 

Mean 4 10 35,43 


s * 
* 
- 
= 
= 
F - 
* . 1 
_ 4 1 — 
1 ** * ” % * 
0 a Mt If a0 2 | 
bots 8 „ 2 4 oo 
1 — A * 4 „ * . * * 
7 4 * 


$1 aha, N. 
Face of limb, Cast. 
June 1 ps * 38,26 Zenith dist. 2* 28 e ber. 755 S be, 
10 37,67 Line of e 3-40. 
> 39,01 - | 
| Mean 2 28 3,31 
1 Draconis N. 
May 8 & 517,29 Zenith dist. 4*:E 375 +4" (eff. lc. h 6 59 30 
June 51,58 Lineof collimation 4.88, ; 
\\ 51, oo x * if 
18 51,12 IE: FE. ny 
ts © 8, 
Mean 4 6 rg 
16 Drau, N. 
June 13—2 42 '26',55 Zenith dist. 2 42.30% 6342", by (ref. cc.) 2 88 42 33 HY 
| $5 22% Lie ot N 3,58. 
18 26 ke | 
I 11 * 2 N . 7 
* 13—2 23' 16,46 Zenith dist. 2 23 20",c842",28 (refr. ac. == 23 22,86, 
16 16,54 Line of collimation 3·80. | | 1 
20 1 
Mean 2 23 * 
10 gui, N 1 6 
june 1 3—0® 41 355 84 Zenith dist. oo 41 40.08 L 068 lock. ds. 220 4140,68. 
16 36,42 Line of collimation 2,15. OST 
20 38,5 
Mean 0 41 36,93 
7 Ursæ, N. 


May * 10 2% 18 Zenith dist 4* 10132“, 46 477 858 aer 10 36",2 3, 
28,58 Tine of collixration 5 — 


13 29,82 | | ” 
I4 ' "2008 1 „ 5 1 
17 3 | | 
* . no a 3 
June 8 30, 24 5 TR 
14·ß¾—A 
1 4 10 29-44 


* 15 
; N Ss | 
2 
* 


< " 


a = — — —  — —x + —_— * GS Hg << ns — 
—— . 1 2 — 


* 
-- 


June he e 25 I 3 


10 | ©, "* bt FI 3 Fo —_ | 5 © 14085 ; 


Face of, limb, Wa”. 8 of limb, \Ea 


May ee May vous 10% Denirh diet. Say 4 7 K er a 
40,10 . 4435 45586 Nine nad | . ber 05 e 


„ e d ES 1 1 Nba 15 

6 . 38,62 june 8 1 e er en 1 
20; «7 oc 18 VVT „ 
38 . 39-9 14 .; 5 
Mean o 18 39,48 Mean 0 18 4554 Sh . REN 


% 


C 7 Urse, N. i V 2 


. May 11—5˙ 20 34",10 May 13—5 20˙ 26,41 Zenith dist. go 20' 30, "5345" 13 (r. ac rg · 2 20 35's 66. 


June. 5 34.15 1 28,46 Line of collimation 3.76. 
11 34% June 8 25 
© 3 Se 20 27,14 8 | 'Þ | 5 . > 144 1 hs 
Mean 5 20 34,30 Mean 5 20 26,77 8 58 5 


85 Herculis, C'S £5 © e Tags e & ah 


May 14 29 5476 May 1 10—4 30 0 a6 Zenith dist. 4* 29 57 148 +4 147 wy &c. =4* 30' 1,95, 
„„ $30 $3. „ Line of collimation. 3-46. | ns, 8 


Mean 4 29 53,98 Mean: 4 39 o 


, 2 SS +. 25 . $ ; 
? 7 = F by | „ 


-v Herculis, 'S. - % Oy We 


May 05 99.98; F 25 2 May 1—4 1 ' 3350 Zenith dist. 4” 1 ' 29", 5543 769 ne Kc.) 1 335 524. 


June 6 32,52 e of n 3.35. CO om 

32256. . 
14 20,51 32,56 | 5 „%%ͤĩ ĩ;[30 dh 
4 e nh — 33,46 $f ors lth ee 
Mean 4 1 26,19 Mean 1 52.90 b „„ 5 eg 


55 » Hereulis, 18. 


May 14—49 16 53",72 May 1 — 17 Fat Zenith dist. 4446 3 20 ber eebee „ a ob. 


June 11 33.23 5.34 Line of een 3-76, : 
-6- -- $203 june 8 - 0,50 Fg 1 n its 
1 O RR. ee Re 
20 | $402, | ©. © 4 0,00 WOT . | | 
SG 81. 0,5 1 NW„VX 6 e 
Mean 4 16 53,70 Mean 4 Tt: 047 On „„ ͤ . es LEG. 


6 F ob 


| 93 
tis of limb, — * Rete 5 ebe 
ay I "291 | May 10-3 ;10 i{Sevith-dixt: 49'33 32 4 1225 ves e. 
| 29,26 133;ͥ pg Line of net? 3.16. ra ws 
; . june 8 35˙04 | 
„%%%ꝙ 35,88 
11 29-43 18 35˙8 ; 
I 21 36,83 
17 29.86 | 1 
20 „ „ ns | 1 
Mean 3/49 wy Mean 3 49 % N . 155 
Feen ; 5 | | 
Capella, 8 6 


May 12—q* 50 55˙5 Fo May — 50 


15 . + Oy 
June 8 54,87 June 11 
15 „ 
_ 56,91 VVV 
8 o ER. pu 
wn 110 „ e 


july 2 20—1* O' 13 ,82—July 3 


W ee e 


1,47 Line of collimation 3˙31. 
2,0 | 
2,26 
5 25,13 „ 22 Mm” | | * 


abet; of the . made at Cl ifton, 0 the northern Exiremity of the meri- 
dional 8 ) and the Zenith Distances of the Several Stars deduced pa howg 


_—_ _ 


Þ Draconis, S. 
' 16” 49.4095 (ef. dect · & 17” fe 


0 ran Zenith dist. 1* 
- "5 13.15 29 20, 26 Line of collimation 3.78. 
28 12,38 Aug. 1 20, 30 
ER 12,15 3 20, 16 
Aug. 3 1 2 20,15 
, WOT =! : 
J 17 20,11 
18 13.80 1 N 
Mean 1 © 13,11 Mean 1 o 20,68 
85 7 Draconis, S. „% ͤ na 
July 2019 2 21%563 1 1 28” 50 Zenith dist. 1 56˙24 „86- 1 7 (refr. IT 0. 26",6 
22 21,47 27,14 Line of collimation e . 
28. . 27,15 - TT, 
5 29 $307 28,86 
Aug. 1 8 28,54 e | 
| 11 20,45 1 28,28 : . 8 
13 21,55 - 2:66 >» 
18 21,03 | 5 ex OY 
Mean I 2 21,56 Mean 1 56 28,16 


— 


| IS 6. 
* = . * * | . 
| 0 3 4 Draconis, * 
Face of limb, Wet, mes of limb, Cast. ASS os 
* 22—35 262396 July gig? a 16˙½1 Zenith dist. 3 26 19 Fare 1 . burt eher 6/21" 
26 22,02 12 N 15723 Line of collimation * f 
29 23,35 „ | A 
hoy JJ a | $ "A Mp 
13 23,7 | 5 ; 5 - l e | 0 {4 
18 43,060 „„ — ce N kt 
Mean 3 26 36 Mean 3 a6 a; e hy" 74. 
TE 46c Draconis, N. i e e 
july 1 53 7˙½%60 July 28-10 53 1”,1r Zenith dist. 1* 53 4 44+1%,80 (ef. eher; 83 - 6", 224. 
| 2232 - 8,01 31 32 69,97 Line 5 collimation 347. | 
Aug. 7 „ Aug. 3 * 1,99 | | . 
x 8,20 . „ 5 3 
JJ ĩ ð 


17 0,84 4 
Mean 1 53 7,92 Mean 1 53 0,97 


1 Draconis, 9 5 
Aug. 7 * 21 733 26 July 28—0 21' 4% 62 Zenith dist. O21 74 17840", 34 (ref. ehe. 21 3,12 


9 33.99 31 42,87 Line of collimation 1 5. | 

113 , 33-83 Aug. 5 42,16 | z; OE, 3 

an 33-45 JJ © i a : „„ 

| „ 41,68 25 e | 
Mean O 21 » 5569 . Mean o 21 41:93 POL 
: FTT Ly z 

July 201" 16 39” 1 Joly _—_ 16 3453 Zenith dist. 15 16 36 K.. 223 bert. debe 16 38",20, 

28 38,98 | 32 292 . of collimation 3-35: 
ET dns. a · Nel . 
Aug. 12 41, 10 bi 


n ; 16 40,22 Mean 1 Ha 33974 


f \ 


16 Draconis, $..- 


. July 30—0? Vans July 20 4 5409 Zenith dist. o* 7 3 (reff. che 7 517 525. 


Aug. 5 © me Line of collimation 3,40. 
Mean Oo 7 545 5 | 
| 1 * Cygni, 8 % 
ul e 72 Jul 26—0· 2 „ 20 Zenith dist. o- 26 140,41 refr, xc. *2 00 „ 
1 y 55 4 * y * 3 Er ar 0 Jaw 27 5 
FRE : Doc % be oy wo begs 
29 36,38 Aug. 3 _ 2,56 e „ : V; £2 
30 55.28 12 4-29 „ . „C Tie 
Aug. 7 „ A eee e e 
V | = | EY Ke, 
13 306, 36 | 5 | 


Mean © 26 ms Mean o 27 3,60 


Ha ef limb, Wort % Ne ob Lat, 


2 25 3955+ 75 a 25 Fg bf EA "3 + af YR A 


29 3 37 N 8 5. collimatic 0 
9 . | s CCC . 
VVV . 1 70 0 
117 | Tied 1 „ : 

* 1 | | „„ | 2 | 

Mean 2 8 35,68 n. 6005 3 8 N JFF DE 00 4 $45 
1 TS Om, Iv & 
Ang: 7 20" 4,84. „„ OE Np 7 HAR. * oh 


T7 Urse, N. 


aug. Fonnaze 300 10” 572 july 292 300 4.59 Zenith dist. 2. 30 8% 1847, 19 (refr. Ke): 30 1 | 


3 l . 1% Line of collimation 37. 50 
Mean 8 30 155 "Mean > 30 * „„ ad Ba 


26 9 17 | 75 Line Wn collimation 3-07. 
Au 24 9 1,07 5 
enn 3 9 , 9 en 9 794 


32 1 WY 


July 287. 7 15% 02 July 29-—7* 7 22",76 Zenith dist. 7* 7 18” 6946" 76 (refr. eher 7 25 45 


SP 14% Aug. 83 23,63 . nne 4.04. 
_ 7 n EO ng ras „ OT . 


22 v Herculis, 6 bo a 
1 3 ws 51 4 july 1 932 Zenith dist. 6* 39 55 2 16. 18 bel. ehe 46 40 'T ag 


Aug. 4 Jo, 64 Avg. * ao * of co llimation 4.16. 
7 3586 : 
EA Ii 8 ; 
Mean 6 39 51,06 Mean 6 39 9% . 
6 ; f s f | 


July 23—3˙ 7 59. 778. Ang. 3 · go 703 Zenith At. 3 9 1 26 ＋ 2 72 (refr. &e) =p s 22 


7 


0 85 : Herculis, S. 8. * . | 
July 2 © 20 . 13 8 237. 20 * 59 Zenith dist. 7 20 18” ,084-6',90 (ee &. =*. 5 24-98. b 
Lo a 3ͥſͥꝙouüm of collimation 4.52. 
Lon +: > "my Sp" 66 23-59. | 

4 1 | | x 

. 7: 14-71. 3 EO 3 
Mean 7 20 "13-50 | | Mean 7 20 22,51 5 . 5 „ BO. 

J nies ua v Hevn $ ; 

July 30-6 51' 46",31 July 21—6? 51 52",89 Zenith dist. 6-51 $0456 35 boar. &c.)=6 oe $6". 
es OT 29 56,32 Line of collimation 44% 
8 Mean 6 51 $4:60 . 


| 1 * 8 be 1 4 1 * 98 8 89 75 LEN 1 | : pots 1 N 1 5 | 
* W 18 29%4 Aug. 17 * ow "35" Zenith dist. 4+ 18" ar”, gen tt; er 18. vo. N 

Hh | 1 ne | og 3670) Li oF coflimation'2,28 Ef OE 
| 28, ; 8 5 Bo 
Mean 4 18 U 8 | Mean 4 1s 33195 5 | 3 . 


Capella, 8 TT on OS 


Aug. 7—5. 40 15” ,bo Aug. 330 0 25 „30 Zenith dist. 7* 40 177t0s T0 rb Ser a 25566 | 
| 18- 1 1,94 546 Eine of en 5730. 'S . 
21,32 3 


Mean 7 40 13,76 Mean 7 or 2 VV 


Reduction of the Observations made at Arbury Hill, (the intermediate Point on 
tte meridional Arc, * an the Zenith Distances f the Several Stars deduced 


e | 
e Draconis, N. * a 


; Sept $0015 47 8 Sept pea! 41”, Ml. Zenith dist. o- 13! / 45h, Sita (re beh. 1 65 
„„ 19 48,20 4 Line of collimation LATE. : 
23 1: 22 43.32 * nh 
7777000000 06-4 
„ 1 r 
. Mean. 0 13 433 "teas 0 13 4% 


„ Draconis, S. 


Sept. REI 18%78 Sept. 11—0* 42 2508 Zenith dist. oo 4 220 ,08+0' . berech 42; rags 
19 20, 1 18 25,43 Line of collimation 2,92. 
| 23 18,03 %%/%ꝙ nr , rent” 
: % . CY 
/ 7 e e 132 
>» 19,21 | © 49 © ⏑ WP AA Lo IR 5 
Oct. 3 18,98 Oct. . e 2 A . — 32 | 1 


J 3 


Mean © 42 19,16 - Mien: E 15 on | os Wc ; „„ q 


* 


— 


46 d Draconis, 8. 


Sept. er 0 25 „36 sept. 1 19”, Zenith J. 4 40 arge 141 | (ef er 6 27 521. 
e 15 29,16 "UE th tenor 5 
| 8 | ; 19 8 28,37 N * IS: 4 ; 1 
5 * 1 . L OL ak 18.88 nd. VV 
5ĩ5ĩA8 22 | „ 
5 35 „ So % Oct. A | — 55 1 | 
r. 2 19,89 {SEO 8 0. ail 
© Mean 4 40 20,4 Mean 4 49 19,15 HE ö 


MIS * n N r 8 « 88.5 T 2 bo - w TILT 
* * $4.5 * . — „ 7 * IG 7 SI * N 
A — = 5585 * ” þ 4 9 * C ve * N * * x < 1 
4 WE * I; * LOS Iv * * 
— 4 1 a FF 3 : * - *» 
* Le » * * Oy 
q * , 4 *, : 4 
2" : 7 , 75 4 & g | — 
1 } 
: * 
1 „ 8 
x 
o 
- 8 
* 
% - 
* 
— 
F — % * 
— 
- * 
8 7 
* . 8 1 
_ 4 N p WF - 
7 y | 97 7 
„ 
* 
- 
% 


* 


46 c Draconis, N. 


Fake of limb, East. 3 | 9 e 


Face of limb, West. 7 6 ” 855 75 15 9 72 my —— 7 oak 
e 6 2 7 1 © Zenith dis. 3 25+ 0 = . | 
|, 3 _ N % Line d 5 10 s 76 | 1 


21 "33s  T©0- - * $56 
23 9.46 1 
30 »»» uot TS 4.3% + ' yh 
: Oet. : „„ a R | 6, | e 
Mean 3 7 947 Mean 3 7 3-04 * TP DO „ - 


a 


— 


5¹ Draconis, N. 


ep. b 26" 01 Sept. gr ai; Zenith dist. of 52 23 "57485 (ei ache =o 522442. „ 


16 27,89 10 23, 30 Line of * 2789. | I 

9» - V 18 21,23 „ e | | 1 

TT 20 20,26 . . 5 15 | 
n RR. 20,06 - . „„ © -. 
29 24,59 or 26 3 20,5 wo at: of 8 : 1 . | > a | 7 b 
S 1 4 2 4 gf nt Ho” | | 
LE as | 1 | v7 | 1 

2 20, 31 ; 1 : Co | "i 
Mean © 52 26,46 Mean 0 oy. 20,68 | : | —_— 


7 or ww oo ” 


2 — 47 4.07 Sept. 7 46 57%,79 Zenith dist. o* 47' 24,16+0',76 r. &c. ©) =o "4 2",92. 
I5 5,52 18 59.68 Line of collimation 3˙22. | 
16 6,59 20 „„ | | = 
18 6,13. at 47 wag IR, 
: 46 59904 __ e, 3 81 nod 


**» OT. 
25 8 28 58, 30 
2 58,56 


29 $267 | 0 | : 
30 5.82 Get. 59.13 . | 0 5 

2 58,79 3 
Mean o 46 58,94 


| Mean 0 5,39 


10 Cygni. or To 


Sept, 19—0* 54 3739 e- 54 7 7 Zenith dist. 0· 54 38˙ 21 +0 528 ber. &c. b 54 PR. 
5 SY 3494. 20 40, 2 Line of collimation 2748. 

r 36,74 "23 - 46 

41,72 


27 


29 


[ 


25 36,83 24 
35˙86 
© $5923. 


41,11 


- 40,78. 


30 34-11 ; ; 40,14 
3 = 40,24 | 
Mean o 54 35,62 Mean o 54 40,59 


3 
— 


3 
* * N 
2 wat.” 
” * 9 4 
9. 1 — 4 
— 
” 1 


9 9 * 5 5 * . - * pl V * OE" M * * * * 
EY — „ 8 — 
— - ” 5 FA 
i 0 : \ , 


5 1 - 
. | KS dec N. 
| Face of limb, Went, * race of limb, bar, ** * 
Sept. * Sept. 182? 34 5",73: Zenith digt, 237 * 749 (nk ehen 3 11,88, 
Tra 5 1 Line of collimation 4-080; | 
Mean 2 3+ 13,67 Mean 2 34 5,51 Nr N 8 
| i 7 Urse, .. ARE > 
Sept. 10— 1 55 1” 8 FEY 20—1? 55˙ 4,41 Zenith dist. 0 55' 370 64 65 ref be. J=1? * 45 62. 
49 54 59,80 The 3 Line of n 8 38 
25 55 2557 20. -;- 7, 1 1. „ 
30 54 574. 28 5,68 in S 
. 1 1 e 
Mean 1 55 0,23 Mean, 1 55 oy | I. 
2 * cha. N. 


Sept. 26—3? 44 1 765 pra . a 99 Zenith dist. 3 44 $5 x 634 373 ns be her 44 126 
A 0e= ©,n2 lay) = Line of collimation 340. = 
Men 3 4 TY 


22 7 Herculis, I 


f3 
* 


3 
2 


Sept. 3—5˙ 25 50,78 sept. 185 25 58',80 Zenith dist. Py 54" 2945" ,03 be. xc. r 250 9895 on 


Line of collimation 4:01. : 


* 


N 


& Persei, e, f | 
Sept 163% ＋ 26,57 on — 4 30,66 Zenith dist. 3 4 29", * z 67 ber. n 4 32,60. 


18 27, 69 1 7 $20 7 NA — 2, 
K . 32,95 25 | 
26 27,10 | 22 © 2 32591 6 5 . 5 5 
"34691008 07) $5.90 J Ta To EP PT» OS 
_ oun 3 4 26,99 Mean 3 40 32,18 Lt 84 
' Capella, S. : | 
zept. 1 26 12˙,39 Sept. 1 —5 26 19,64 Zenith dist. 6 26 16",4646%,44 ref 80. )=6 26 24˙½90 
13,75 1 138, 89 Line of collimation 2,89. 
> JJ 
e 14,68 20 19,10 
23 12,93 1 18,03 | | 5 
26 14,48 5 19,64 1 


Mean 6 26 13.61 | Mean 6 26 19,39 


| Reduction il the ee made at the Hou ann and the Zenit 
Distan ces of the several Stars deduced 8 | 


2 Draconis, N. t 
A605 58˙ 1. 66 Aprilag—O * Wy x roger dist. oo 58 32 ",14+0" 299 (ef, bee 55 33 „13. 
25 36,02 | Line o. 2 4,0% 
Maw o 58 549 : 


Aj 


99 


E 


nee of limb, * 15 e limb, un, 11 


19-0 229% 2401 20,54 Lhwats dh 75 
Meh 0 2 250 Mean « 2 2 19,9 ine af 974 . 1 . 
ma? cad, latte pag! en N. iu de eg 
April 19—5 25 14,51 de- &,17 Zed es eg . ere 18981· 


28 14.03 Line of collimation 4,05. 
Mean 5 25 14427 — e 


Fl 


46 cDraconis, N. 


AT ns. 
a; 51 Ha N. _ | 
April 19-1 37 18% 23 n- 8279 Zenith dist. 1 37 Kr bock. ber- 37 1415. 


25 14,2 * — 3581. 
Moan I 37 16,42 5 


N « "A Ms a 6 % . IT 2 5 


April TY 37 54 14 becher ww 486 Zenith dist. 1* __ 50”, 39+1 "48 (ref Kc.) 15 z 51 "By. | 
Line of collimation 3,74. 


* 


271 . — 


5 10 « Ogi. „„ 
April 19—0˙ of 45" 0 April23—o" 9 33˙ 90 Zenith dist. o 9 49 „414020 br. bc.) =o 4 49*,60. 
809 Line of collimation 744. 3 
Wy 4 * 5 ene 
April 24s" 9 708 8 18 1 Zenith dist. 30 19 1 — bes. "EP 19 4",6y. 
| 1 55˙55 Line of nn. 5.68. : 
= 23 56,12 
Mean 3 18 55,78 
f 8. 5 5 3 


April 16—1* 10' Io", 19 April 231 10 17",60 Zenith dist. 10 10 / 13 85 L 22 treff 1 10' 15 "207 
Line of collimation 3.70. 


— - ; i h 


Begg 4 Harulis.- tion 9 : „ 
- April 16—5® 20' 200 47 ane 20 "IF oO Zenith dist. 5 20' 25", 104+ 5 ef ue 25 20 0 %%. | 
uth o Lins of collimation 6,93. 0 0 : wy 
| Mean 5 20 ART 5 353 a 
» 13 April 135 41' 21,09 Apes 4 es Zeffith dist. 50 47 2424379 bel. erlag 41˙ gr „21. 
337 "mi 22,74 8. Line of collimation $3 b 
Mean 5 4¹ 21,91 RY yo 


1 — — _ "LR. _ 
C33. k 


1 
1923 
EF J 
2 ö 


„ „* 


. 5 * — 5 4 . 
j 5 0 | 
b 5 Previous to my entering on the following article, it max 
W not be improper to exhibit, under their proper points of view,” 
„ the several quantities derived from ation, ex pressive of 
3 the differences of the zenith distances, or the deviation of the 
| point of intersection of the and horizontal wires from 
V 2 Dunnose. 5 | 
1 p Draconis — 6 . 
| 465651 — = os 15 | 
DOE de 12 Ce e e Me 3G 
2 85 ry = — | « & 28 85 7 5 Da Po 3 3 f 1 "Se 1 * - « — 
| „„ 85, Herc ulis N 
: 85 . 2 — 6 WIS PSs 5 - | 35 


- 
* 


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, . ß 


1 2 * * * * I « We © * P *. 1 £ & 
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> . -N 5 
10 An Account of the Meanmomant © 
Amplitude of the celestial Arc comprebended by -the Station 
| | Dunnose ne Clifton. ON. OS. ND OY 
'B Draconis. DE 2 "ONE © wg 
Ange, OG: | 8 e „„ „ 
zenith distance at Dun nose 1 5c. 4 Zenith distance at Dunno: 0 18 42,9 
Ditto Clifton . 1. © 19, 84 | Clifton "4 * 9 69 
Amplitude of are 5 in 50 23: 3 of are 2 50 24,05 
y Draconis. IM Une. oe FE 
Zenith * at Dunnose o 53 56, 63 Zenith distance at 8 4 10 36,23 
| _ Ciiftin - 1 56. 26,64 | lifton — 1 20 13,53 
Amplitude 5 fa Sa” Amplitude of are 2 50 22,70 
45 d Draconis. =; * 
Zenith e at Dunnose 6 16 47.66 Zenith dixtance at Dunnose 5 20 35,66 
| Clifton® 3 26 22,92 - Clifton 2 30 10,37 
Amplitude of We: 2 50 24574 Amplitude of arc —_ 5 2 50 25-29 
= 51 Denies.” 5 _— Feels, | 3 
Zenith distance at Dunnose 2 28 44,05 Zenith distance at 8 "4 17 tas 
Cohan o 21 38,12 * Clifton 8 25-45 
Amplitude of are 2 50 2217 Arlitode of are 2 2 0 * 
„ Baie „„ 85 Herculis. 
m_ distance at Dunnose 4 43 28,93 _—_ distance at Dunnose 4 30 1295 
9 1 $3 6,24 Clifton 7 20 24,98 
Amplitude 1 2 50 22,69 | Amplitude of are 8 50 23.05 
16 Draconis. v Herculis. | 
Zenith distance at Dunnose © 2 42 33,26 Zenith distance at Dunnose a I 33-24 
„ + Ren” D 7 5¹, 5 Clifton. $# 7 56,80 
Amplitude of are 2 50 24.61 Amplitude of are — 2 50 23.56 ; 
Yo, ACC. 22 r Herrulis. 
Tenith distance at Dunnose 4 6 59,30 Zenith en at Dunnose 3 49 37,10 
Clifton 16 38,20 8 Cm '- 6 40 1,29 
Auglltade of ©: 1" 50 21,10 | Amplitude of re | 2:50 2419 
| 10 Cygni. . Capella. 
Zenith distance at Dunnose © 41 42,68 Zenith distance at Dunnose © 4 50 2,88 
| Clifton © - 2 8 42,22 eg 27 40 25,66 
Amplitude of are © . 2 50 22,90 15 Amplitude of are re 5 1 50 22,78 
1 ni. N WT | 
| Zenkth distance at Dunnose 2 23 22,86 
_ Clifton „3 07 G8 - 
Amplitude of are 3 50 23,18 of 


3 


Abi, Fa ihe ani - a e comprebended „ the Stations 


41 Draconis. e rs 
\".S.. 0 F 
Zenith Turns at Dunnose 1 50 5,24 
IT ; ben Hill © 13 45-82 
| Amplitude of arc : ; — 3 36 19:42 
Es Draconis. 
Zenith distance at Dunnose o 53 56, 63 


? Arbury Hill « © 42 22,73 
nenne of ar nN 1 36 1936 
45 d Draconis. 


Zenith distance at Dunnose 


6 16 47,66 


Arbury Hill 4 40 27,21 | 


| Amplitude of are 0 ind 20,45 | 
- 4 Draconis. 
Zenith distance at Dunnose | £28 44,01 
Arbury En O 52 24:42 
Amplitude of are 1 1 36 10,59 
46 C Draconis. 
Zenith distance at Dunnose 4 43 28,93 


0 Arbury Hin 3 7 9.30 - 
 Anplituce of arc | 3 5 19,63 


— > 
_ AE 
b . 


— 


 Dunnose and Arbury Hill. 


1x Oni, 
4 e 
Zenith distance at Dunnose 2 23 22,86 
| wal þ Hil 0 47 2,92 
| Amplirale of are — 136 10% 
* 1 gal. 5 
Zenith distance at Dunnose | o 41 40,68 


| ie Hil 0 54 39-99 
nag of are 


1 35 107 
8 1 Ursæ. | 
Zenith distance at Dunnose 0 18 42,93 


Arbury Hill 1 55 4:63 


— 


'Awplitade of arc . 21,70 
2 

Zenith distanee at Dunnose 4 50 2.88 

Arbury E 26 22,90 

amplitude un; > 1 36 20,02. 


D. 2 between the Paral 5 of Falte oe Dunnoxe and 
Greenwich. | 


B Dei 


We distance at Dunnose 
Greenwich | ,0.58 3313 


„ * 


Difference of latitude © 51 3911 


£0: 50 5.24 Zenith FE NOR at Wee 


7 Draconis. 


080 79 F * 


o 53 56,63 


2 Greenwich © 2 24939 
Difference of latitade 0 51 32,4 


— — — => 
9 —— — — — — 

* . — 

wr" - 


— 5 


ET” K* 


—— — 3 — H — — 
— — — — — — — — 2 — — aw 2 
— 2 


— 
1 — 


——— 


—_— —— 


4 3 


1 
a % * . 

* N y * — — n 8 * a £4 . * 5 * 2 

_ _ N — — : * * 4 = © xz - 8 7 * Cr) _ 3 1 0 "of * "FB m 
— =; Tims pug ay 2h DEST HY * = = * * Rand a HY = Ce RE . n A "2.0: * 

5 . n 88 ——_ x — — ) 2 a 2 

8 — 8 5%; 2 8 8 7 wa _ '2 : FADE. 

- - — — — — — — A 
—— — = — —-' = =X — Orr gt : — 
2 . n n 2 
* 


* 


© * — 
« va 2 * 
% 1 * 
n 
— — 


I" a * * a 
2 > 27 nr 18 to 7 L a! 
9 r KT « 
* £ * * N * * * II Fs 5 7 , s : ; a * & — 
* * 9 1 5 * * 
* * 


1 82 * 7 £ 
. wet "4 * Io 


. 


wy : . 
# * * 


„ aces; of the Meas 


| N 1204 n Wes WR : . 
45 d Draconis. : aha > gn. . 
. „ | | * a 
| "Zenith distance at 8 6 16 47,66 Zenith dixtance at Dunnose 0 3 40,68 
TE: 2 5 Oreegwſch E 25 15,81 0. | 8 e Greenwich 0 9 49-60 5 
5 1 | Difference of latitude. 0 51 31485, * Difference of latitude 0 51 30,8 
51 Draconis. 1 „ 5 
< Zenith dixtance at Dunnos 2 28 44,05 Zenith distance at Dunnose 4 I 3643 
Greenwich I 37 1% 5 Greenwich «hep Ts 


: 1 25 5 i 8 - , 1 * Cygni. Es 7 # 
Zenith Re at Dunnose 2 23 22,86 
= | Greenwich 


Difference of latitude 0 E 1 30,99 


"War + | Difference of latitude. pon 29.90 +. 


"Zenith dutance at Dunnose 
Ren $8607 ; 


Difference of latitade o 51 5880 
= Urs. hg 

_- Greenwich x 1 20 15% 

Difference of latitude « o 51 32,14 


4 


% 


1 will now be proper to exhibit the various * lte, as pre- 
w, deduced; the amplitudes of the e arcs will Youu | 


Nr as follow. 


Are between Dunnose and Clifton. 


B Draconis „ 5 


6 . 
— 
2 


« # * 
1 


» 
7 4+ « 
7 I 1 
— 
— 
0 mg 4 
: F 

22 * * 
\ £ n — » * « 


x 45d — _ _ 
Fe FR 
46 Cm 2 ” a2 
51 8 — — — — 
16 3 — 
* 1 0 — ] — — 


1 „ Cygni . 


— 
1% le fe 
8; ; Herculis PO vi Tues, 
52 — * — — = 
\ . * s 'x A y 


2 50 3 N bo. 


23,27 
24,75 


22,17 


24,51 27 
21,10 


n ploidy. Mean 23 75. 
23:9 and * be * 


22,70 FFF 5 
24,05 „ | 1 
* 2, d s 
| 22,90 Wo e e 
23, og | f 


23,5 ; FA 5% 1 2 ; bs | FR. 
24,17 | 


LODI ond # pln hd | 
1 


2 50 23,38 


a — 2 n 5 ap : 
PPP 3 . . 9 . 
o D N WP " g OS . * 

7 7 4 5 


FW 4 af 9 


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I 
wel oF” 
. 


1 


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3 


4 


238 


— 


- 


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” 


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4 


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1 


11755 


stars there 


Or 


Y 
* 
by 


* 
$ 
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4 
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wu 


* 


n 
% 1 1 


MARLBOROUGH 


we 
If 


* 


From the o Sc 


and tl 


106 


them, if 1 oe proper. His Grace. was pleased to com amply 


83 


with my request; and I now avail Le e xelf 100 the e pro- 
_ cured Bla, that oondesdension. . 15500 


7 ' in ad C * 7 e ? a ˙¹ c Fos re. FR * 
KR. Aa * * 
* 
. * „ N 
v 8 2, 8 . 53 Þ 
i 4 


Ms IL Blenheim Oberg.” 


7 . Ty. & | " „ mee 06 her hor reins 


© _  Distances of: Ly Draconis, reduced to the Beginning of the 


from Observations made i in ve 0 7 ears, by 
his Grace the Die of ManLBO Oven. os 7 4 


16% 
[ ＋ Bae, "8 . * 
9 * 1 8 Oy 
4 wo” 


t ot of 1794, of 19 17/33 2 Draconis gouth of the 
e 1795 a e ee zenith. 
. K i 1798 17,332 — vg 
Woke Mean o 19 17,46.” "Therefore the mean 


distance of y Domi at Blenheim, on the ist of January, 
1803, may be taken at O 19 23 „6 south. The zenith dis- 


tance of this star, at the same period, at the station Dunnose, 
as derived from the late operation, is 05 53. . 63 north; 


LAT Ta & © 2 


therefore,  59' 56,63 + 0 19 2g",06 = 1* 14 19",6g, is the 


of latitude)between Dun and Blenheim observa- 
perhaps, it may not be improper to advert to 


| ; page _ of the, ; Phil. Trans. for 1800, where the observed and | 


puted latitudes are given, the former being 31˙ 50 a 5 i 
and the latter 31 50 28,1. The latitude of Dunnose is 
50? 37 8',21,: that of Greenwich being taken at 51* 28“ yo"; 
F difference o 51 -g1 „39, as : derived from the observa- 


* 


an a * 


tions made with the new sector. Hence, mY 3705 bn + 
1.19/19! ,69= 51. 502709, must be the latitude of Blenheim, 


of ca second of. the truth. But it vill be. 


within a, small par 
60 dwell on.this ag at praventt; 1 and 


— 


* 


2. Dunnose and Arbury Hill 
Hill and Clifton 


6. Arbury Hill and Greenwich 
10 75 7. Dunnose and Blenheim | 


8. Blenheim and Clifton, - 


: 


| Determin ation of the Lengths 0) the Degrees on. the Meridian, i in 
a middle Points of the several Ares given in the last Article. 


On a reſerence to t the Phil. Trans. for 1800, it will 
that Blenheim Observatory is 446458 feet from the pe 
to the meridian of Dunnose. But the 
cular at, 6 "that observatory, where it cuts the 


e is an of a 80 in Jatitude north 


Gen at Bl en! heim 20. of . This — we . 
the following terrestrial arcs, in conjunction with the preceding | 


„ Dunnose and Clifton” | 
L Got 2. Dunnose and Arbury Hill 

3 3. Arbury Hill and Clifton e 

0 . Dunnose and Greenwich 
rat Greenwich and Clifton - 8 


* 
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. 5 . . e Hill and eee ene . 


. 


oY | | ieh TA LOTS BY 


” 


a * 75 
— i 


0 8. "Blenheim and ene = Yo Seats” hw 


a> 


P 1 4 . * mug „ $89 < 7 
14.44 | ds be 21441 4 4 


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fe 7 4 A 4 1 1 
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— — — <> ORs 
a — = - E — 


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2 - - — Oe, warty, > tag yn 
— ̃ 2 7—Ü¹  —— ——— 


— , —˙  — — —  ———— 


"x 


RR 


dere Be, 3 eee eee 
e Arbury Hill and Clifton | 


by 
5 
$ ? F d 15 28 
4 8 * ag Gb Gs > 
Ky CI IT nnose. .and nwich 2 
5 . 3 4 n Fg 


S 5 K p * 
8 uy * by 


COONS ET, © rn and Clifton g oo 

©; ON Gs © Arbury Hill and Greenwich 
Z een 
eee, 2 7" > = gan an D unnose 60890 
Taking the latitude of Greenwich at 515 28 40”, from the 

several ares now given, the tudes of their middle points are 

easily found; and, with the lengths of the de n pri 


3 Hill and Gremyieh, 


© Dannoge and Arbury Hill 
Blenheim and Dunnose ha 


* 85 18,2 60864 


noe en e 13 18, 60890 
Dun and Greenwich, .. — 31 2 "ey bega 


— 
2 


o 
* 


* 94 
1 — 4 . 5 Us . 
* P 4 9 4 + * * * 


Vote. The altitude of Arbury Hill, the level of the ky 45 804 feet. The 
altitudes of the stations southward of Arhury Hill, are are given; in the former accounts of 
the trigonometrical operations : those to "We northward of Fe Hill way by found 


from the f enn # | 
At Sutton, Hea wc 8 . 1 8 e Cale Ring, 
„ 4 Corley, dep: 14 2068 


Orpit 
lev. . 1. 
Te dat 


 Heatbersed ts, 275 
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elev. 12 0%; Sutton, elev. 7 12 "—At N Hill, Cotley, 
dep. 16 of Castle Ring, « ep. 12 30"; Sutton, dep. 19 


; Grp Heights, dep. 6 3 5". A 


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position. Perhaps, also, I should not fail to observe, in 
place, that although the instrument was Ae inte the 
plane of each meridian by means of the telescope attached to 
the side of the great tube, and the aimuth circle, Ar having 
two good chronometers in my poss« 
the truth of the s — wi 


= arc ade en os: Butito return, if there error in t 
amplitude of the total arc, W a deflection of the plumb-line at 
either of the stations, it is not probable that any such deflection 
existed at Dunnose; as the deviation of it t 
from a deficiency of matter towards the channel, would tend to 
diminish the inequality between the n of the two degrees. - a 
This will be evident, on .conside | here: 1 i 
to believe that the — vas edn. e _ Lara $7 
from the action of matte ; both at the northern extremi | 
arc. and at Arbury: Hill, but more particularly at the first- 
mentioned station. If this were parlly the case, and both ! Dur 
nose and Arbury Hill were free from any such prevailing c: ce 10 "4 ; 
the total are must be too great, if taken at 2 30 23,38, by 
about 8”, nearly answering to 2" on each degree. A deviation of 
8“ from the true vertic: arge quantity; nor can the cause 
of it be assigned, 


Arbury Hill. If the error, thong a 
served, be 3uppoced_ 1 to exist at Duppose it 


9 


Co 


4 


wore chan 105 and that t from the/elivots of attrac 


12 — Hill or the northern extremity, of the "meridional line. „ . 


in the kr; of the whole arc; and its co 
| one, with those of its.pa 


on, where a the deficienty of matter would lead | e 


£ V4 5 » 15 8 4 wh x * a" ps $ * 
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y aware that it is 8 eee 1 | 
the.h plumb-line of a sector would deviate from the trus 
vertical Si RY a quantity. Thus, for instance, in a chalk y 
county, like the southern as the kingdom, if the FOR 


men 5 n the terminations of two auen nnn 

of chalk and the other of n 

terials, the effect would be as we have found But, at Dunnose, 5 a 
mm e reason to beli IM 
ppearances, that it will do so, with regard either to. 


very of the disagreement 


s, which led me to apply to his Grace 


the Duke 0 Tu ARL PORE 10 888 the observations mode at 


| to de ds as the are eee injec the mee 

l at Blenheim and Dunnose, deduced from his Grace's observa- 

tions, and those made at the latter place, with the meridional 
distan 
degree on the meridian in latitude 31 1g'; which agrees nearly 5 
with the length N 

Greenwich and Dunnose. However, under all considerations of 

the means by 

am inclined to believe there is an un 


446498 feet, give 60890 fathoms, for the length of the 


the degree at the middle point between . 


h the degree in 51* 1g' has been obtained, I | 
tainty in it, YO * 9 
an answering to about 3 inflatitude.'. , 


But, if the measured space between his Grace's obgervatory . 


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1 len mr of a © Tres. u Rar 8 — in latitude e — 


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Fable, The meridional. distance 1686595. feet; Ter v2 
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regard to the eg ien, | 
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