None
Acceleration of gravity at poles = 983 -2 ; at equator = 978 -0 ; at 45° = 980 -6 ; at New York = 980-2; at Greenwich = 981 -2; at 0Matitude = 978 (1+0-0052 sinV). 1 gram of water TC. = minor calorie =4 '2 x 10^ ergs =4 -2 joules. Latent heat of water = 80 ; of steam = 539. Specific heat of air at constant pressure =0-237. Ratio of specific heats = 1 '40. Capillary constant of water =7 -7, of alcohol =2 -3, of mercury =50 mg./mm. Velocity of light in vacuo =3 x 10^° cm. /sec. Wave length of sodium light =0-0005893 mm. Length of the meter in wave lengths of red cadmium light =1553163-5. 1 ampereof current deposits I '118 mgr. of silver per second =0*1740 c.c. (H. audO.). A plate of quartz 1 mm. thick at 18° C. rotates the plane of polarization 21° '71. Ohm = resistance of a column of mercury 1 sq. mm. cross-section, 106 '3 cm. long. E.M.F. of Latimer Clark cell at 18° is 1'434, of cadmium (Weston) cell at 4° is 1-0190. The solar constant = 3 gram-calories per sq. cm. per minute. The mass of the hydrogen atom is= 10~^ gram ; of the electron is = 10~^ gram. Value of e/w=4-6 x 10^^ electrostatic = 1 '5 x 10'' electromagnetic. Velocity of the electrons — beta particles =2 -7 x 10^°, alpha particles=3 x 10*. Probable speed of a molecule of oxygen at 0° C. = 376 '6 m./sec. , of hydrogen = 1500*9. Mean free path of a molecule of air at a pressure of 76 cm. and at 0° C. =9-6 x 10~*. Number of molecules of air in a c.c. at 0° C. and 76 cm. =6 x ICP*. One atmosphere pressure =76 cm. of mercury=l'0132 megadynes per sq. cm. A knot is a speed of one nautical mile per hour= 1*1515 statute miles or 1853*25 meters per hour. A miner's inch of water is from 1*20 to 1'76 cu. ft. per min. =0'708 liter per sec. Ratio of the probable error to the mean error is 0'6745 (2/3). • Light year is the distance travelled by light in one year=9'467 x lO^^ kilometers = 5'8825x 1012 miles. INDEX. PAGE Abbot, Gen. Henry L. - - 211 Abraham 4, 19 Absolute measurements • - 204 Absolute system - - - - 200 Academy of Sciences, Paris, 47, 48,  St. Peters- burg 71 Acts of Congress 119, 121, 127, 128, 129, 131, 132, 210 Actus 26 Adams, John Quincy 109. 116, 116, 117, 118 Aeginetan talent and mina - 27, 28 Airy, Sir G. B. - - - 100, 247 Ale gallon 35 Alexandrian talent - - 25, 32, 33  Amphora 28 Angle, Measurement of - - 202 Anglo-Saxon measures of length - 36 Angular acceleration - - - 202 Angular velocity - - - - 202 Anti-Metric argument of American Society Mechanical Engineers 145-162 Apothecaries' pound - - - 32 Ar 142 Arabs, Measures of - - 29, 38 Arago 100 Arbitrary units - - - - 5 Arbuthnot 10 Arc of Meridian, Measurement of 55 Archinne 94 PAGS - 54 - 76 - 11 20,23 45 Are - - -. Argentine confederation Ark, Dimensions of Aroura Arpent Articles of confederation, Weights and measures in - • - 109 As, Roman unit of weight - - 26 Assize of bread and ale 32, 35, 242 Association geodesique - - 71 Assyrian documents. Measures in 16 Astronomy, Babylonian - - 12 Ater 23 Athena,  Hungary signs metric treaty 75 Autun, Talleyrand, Bishop of - 46 Avoirdupois pound 33, 34, 35, 122, 123, 248 Babylonia, Measures of 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 22 Bache, Professor A. D. 122, 123, 124  - - 188 Bancroft, George - - 125 Barcelona . - - - 49,56 Barker, Geo. F. - - 211 Barley corn as a unit - -8,29 Barnard, Prof. F. A. P. - 129 Barus, Carl ... - - 211 296 INDEX PAOS Base measurement - 55 Bassot 41 Bath 20 Beal 6 Belgicfoot 31 Belgium adopts metric system 91 Belhaven aDd Stenton, Lord - 101 Beooit, J. Rene - 69, 219, 251. Berthollet - 54, 99 Bessel 40, 223 Bigourdan, M. - - - -41 Binary subdivision - 179 ' Bird standard - - ■ - 214 Bismer-pund - - - 96 , Black cubit 29 : Blaine, James 6. - - • 159 ' Board of Trade British specifica- tions 215 Board of Trade electrical stan- dards 242. Body measures - - 6 ' Boeckh - - - -11,29,30 Boisseau 66 Borda - - 47, 48, 54, 250, 251 Brandis, J. 11 Brazil and metric treaty - - 75 Briges, Ernest R. - - - 187 ; Brighton railway, England - - 168 | Brisson 54 British Association committee on units .... 205,207 British Association unit of resist- ance 207 British engineers in Egypt - - 92 British imperial gallon - - 36 British imperial standards 245, 246, 247, 248, 249 British imperial standard yard - 246 British pharmacopoeia - 192, 197 British standards of length and weight - 245, 246,  - 234 Bunge balance. - - - 238 Bureau International des Folds et Mesures established - - 76 Bureau of Standards, U.S. - 131, 132 Cadmium spectrum. Lines of - 261 Calendar, French reforms in 52, 53 Caliph-Al-Mamum - - - 29 Calipers for standards of length 224,229 Canaan, Civilization of - - 19 Capacity, Electrical - - 203, 209 PAGB Capacity, Measures of 5, 27, 28, 35, 144, 240 Carat 3,25 Cassini - - - - 44, 49, 54 Cattle standard .... 3 Centesima 43 Centigram - - 146, 147, 148 Centiliter 144 Centime 45 Centimeter 139 Centner 86 Centuria 43 C.6.S. or centimeter.gram.8econd- system. 102, 199, 205, 206 C.G.S. electro-magnetic units - 207 Chambers of Agriculture favour metric svstem - - - 102 Chaney, H. J. - - 30, 37, 247 Cbappuis, M. - -. 261 Charlemagne - -. ■ 37 Charlemagne. " Pile de ". - 39 Chase. Salmon P. -. - 126 Chicago congress .... 206 Chisholm. H. W. -. 25,32,33,244 Clark ceU 207 Clark, Capt. A. R. - 69 Clarke's spheroid- - -. 62 Coast and Geodetic Survey stand- ards - - 114, 121, 122 Colles, Geo. W. - -. - 133 Collet. M. A. - - - - 258 Cologne, Mark of -. 32, 40 Colonial Crovemors, British, favour metric system - - - 159 Commemorative medal for metric system - - - - 63, 64 Commercial pound (libra mercatoria) 33 Committee on coinage, weights and measures reports 73, 75, 87, 90, 91, 120, 121, 128, 130, 133 Committee of weights and measures and of moneys of Paris Ex- position of 1867 ... 85 Comparison of standards of length 229 Comparator of Borda. >. 230 Comparator of Lenoir - - - 230 Compensated  128, 131, 132 Conservatoire des Arts et Metiers 69, 250, 251, 252 Conservatory, Meter of - - 73 INDEX 297 PAOK Continental Congress, legislation on weights and measures, - 100 Corinth, Units of weight in - -27 Corn bushel 36 Com gallon 35 Corps Legislatif receives standard meter and kilogram - - 63 Cotton values quoted decimally - 167 Coulomb 64 Coulomb, unit of quantity 203, 206, 207 Cross-wires - -. - 231, 234 Crypt chapel .... 30 Crystal standards - - - 236 Cubit - -  -  .... 144, 145 Decameter .... 138, 139 Decigrams ... - 146, 148 Deciliter 144 Decima  Decimal system of Jefferson - 111 Decimal system of money pro- posed in France - - - 45 Decimes 45 Decimeter .... 138,  signs metric treaty - 76 De Pury, Charles A. - - - 168 De Sarzec, E. • - - -14 De Scliubert, Gen. T. F. - - 69 Dessert-spoonful .... 198 Digit 6 Directive force .... 202 Dividing engine ... - 225 Domesday lK)ok - - - -31 Double weighing .... 237 Drachmas 27 Draughting room, Metric system in 181 Drusus, Foot of - PAGE - 26 Dunkirk -  - - 34 Edward II.. Laws of - - 36, 242 Edward III., Laws of - - 243 Egypt, metric measures - - 92 Egyptian measures. Ancient 11, 20, 22, 23, 24 Ehalkus 27 Electrical congress, Chicago 208, 216 Electrical congress, Paris - - 215 Electrical congress (St. Louis) 216, 241 Electrical measure, U.S. units of 131 Electromotive force - - - 204 Elephantis, Cubit of - - - 22 Elizabeth, Standards of 34, 36, 243 Ell 26, 36, 89 EUe 83 End standard (m^tre k bouts) - 74 End standards  - - - 98 English Bible, Weights and mea.s- ures in 20 English parliamentary accounts and papers - - - - 91 English yard 3, 31,  109 Exodus, Weights and measures at time of 20 Export business and uniform measures .... 133 Ezekiel - - - - 20, 23 Fabbroni 256 Farad 203, 206 Farmers' Associations favour metric system - - - 102  30 Floreal 53 Foerster, W. .... 87 Foot 6, 25, 26, 31, 37, 38, 44, 89, 112 298 INDEX PAOB Force, UniU of - - - 200, 202 Forney, M. N. - - - 185 Foster, Secretary of State - - 159 France, Measures of - 37, 43 French Academy .... viL, 35, 39, 221, 223, 228 Guizot 83 Halsey and Dale,  Charles S. - - - 211 Haute-Guyenne - - - - 45 Hatty 54, 62   129 Henu 23 Herschel, Sir John - - 7, 164 Hilgard, J. E. - - - - 129 Hin 21 Hindus, Weights and measures of 18 Hiuen-Tsiang ... - 6 Holland, Metric system in - 82, 93, 94 Holton, Michigan, Base at - - 141 Homer 21 Honimel - - - - 11, 12, 13 House of Commons Committee report 100 House of  - - - 35, 249 Imperial standards 245, 246, 247, 248, 249 Inch 26, 36 India, Ancient measures of - - 6 INDEX 299 PAGE Inductance, Unit of - - - 208 Ingham, S. D. - - - 120, 121 Institution of Electrical Engineers 186 Instruments of precision. Use of metric system in - - - 181 Intensity of magnetism. Measure-  Measures - 75, 76, 77, 129, 221, 226, 260 International Commission 61. 72. 97, 216 International Congress of Elec- tricians (Chicago) - - - 208 International Congress of Elec- tricians (Paris) - - 207, 208 International Congress of Elec- tricians (St. L^uis) - - 216 International Convention of Weights and Measures - 75 International Coulomb - • 209 International electrical units 131, 199, 209 International farad - - - 209 International Geodetic Association 71 International kilogram. Definition of 78 luternational metric commission 72, 73, 74, 75, 76, 77, 78 International metric prototype standards - 76, 77, 252, 254, 255, 256, 257, 258, 259 International ohm - - 207-209 International Postal Convention 127 International Postal Union - -151 International prototype meter 130, 136. 221, 252, 255 International standard kilogram 78, 258, 259 International Statistical Congress 126 International volt - - - 209 Invariability of standards - 219, 260 Israelites, measures - - 19, 20, 21 Italy, Metric system in - - 93 Jacobi 205 Japanese weights and measures • 93 Jefferson, Thomas 110, 111, 112, 113, 114, 115 Jeremiah 23 Jews, Weights and measures of - 19 Johns, Rev. C. H. U.  or Kiti 24 Kater, Captain Henry 99, 100, 119, 120, 122, 222, 245 Keith, Rev. George Skene - - 99 Kelly 31,37 Kelvin 101 Kennedy, A. R. S. - - - 20 Khar 8S Khet - - 81 Kilogauss 21ft Kilogram 50, 62, 63, 73, 74-146, 147, 256, 257, 258, 259 Kilogram of the Archives 73, 74, 75, 147, 256, 257, 258 Kilometer - - - - 50, 138 Kilowatt 206 King Edgar 30 Kirwan 98 Kiti or Kat 24 Koenigsberg standard - - - 223 Kohlrausch, Rudolf - - 201, 205 Kor 21 Korn-Tonde 96 Kupffer 234  Larsa - - - - 13 Lathes 182 Latin prefixes .... 137 Latin Union .... 85 Latitude, Determination of 56, 57, 5$, M Lavoisier - - 62, 98, 98 Leading screw of lathes - -   134 Liter 54, 145 300 INDEX PAGE Liverpool Cotton Association - 167 Livre 39, 45, 97 Livre de Troyes - - - 33 liTre Esterlin • - 32, 38 lirre poid de marc • • - 39 London Exposition of 1851 • 83, 84 Longitude 59 Long ton 168 LMk XVI. 45 r, Measurement of - - 178 Maass concordats 83,97 Machine shop, Metric system in - 182 Madison, President James - - 115 Magna Charta, Weights and measures in - - • - 32 Magnetic field. Unit of - - 203 Magnetic pole, Unit of - - 202 Maine  40 Mam» Measures of - - - 146 llasler Car Builders' Association 173, 185 liwMS, C. 250 Maxwell, (unit) - - - 203, 215 Maxwell, J. Clark - - - 260 Measures of capacity - - 144, 240 Mechain - - - 41, 54, 60, 61 Mechanical engineering and manu- facturing, Metric system in - 172 Mechanical engineers, American Society of - - - 145-162 Medical department of the army 192, 195, 196 Medical department of the navy 192, 195 Medical papyri - - •  Mendenhall, J. C. 211, 260, 261, 262, 263, 264, 265 Micro-farad 206 M icrometer-microscope 230, 231, 233, 234 Micrometer screws - - - 229 Micron 140 Milan, Metric system Introduced in 82 Mile 26,31 Milia pasuum - - 26, 31 Miller, W-. H. - - - 35, 248 Miller, Sir John Riggs - 99, 163 Milligram .... 146, 148 Milligram weights - - - 148 Milliliter 144 Millimeter -. 138, 140 Millimicron ... - 138, 140 Mina , - - - 16, 21, 25, 27, 28, 32 Mina, Babylonian - -. 16 Mina, heavy. - - - 16 Mina, light 16 Mina, Phoenician - - - 16 Mint, U.S., standard troy pound 119 M'Leod 99 Modius 28 Moment of rotation. Unit of - 202 Momentum, Unit of - - - 202 Monge 48, 54, 99 Moore, Dr. 123 Morin,  - 127,129,211 National Assembly (French) - 46 INDEX 301 PAGE National Bureau of Standards - 132 National Institute of Sciences and Arts (French) - - 53, 63 National Physical Laboratory (England) - - - 152,241 National prototype meter of the United States - - - 130 Natural standards ... 5 Natural units .... 5 Neutral plane .... 222 New Hampshire approves metric system 125 Newton's rings - - - - 261 New Zealand adopts metric system 102 Nickel five  Origin of weights and measures - I Ounce - - -. Prony . - .. Ptolemy Lagos - Pyx chapel - 202 185 53 197 98 54 24 30 Quadrant (unit of inductance) -  Anne, Gallon of - - 35 Queen Elizabeth, Standards of 35, 36, 243, 247 Quintal .... 146, 147 Quito, arc 44 Railway shares 167 302 INDEX PAOX 13 207 43 15 162, 241 203, 204.205 - 102 26 - 40 - 31 - 148 3, 4, 18 148,236 185,235 Rawlinson - Rayleigh, Lord Rayon astronomique Reed - Regnault ReichsaDstalt Resistance - Retail Trades Associations metric system Rhine countries. Measures in Rhine foot - Richard I. , Laws of • Riders .... Ridffeway - Rock crystal standards Rogers, Wm. A.- Rome, Weights and measures of - 26 Rosenberger • - - 204, 205 Rosebery, Lord ... - 101 Rowland, Henry A. - 207,211,226 Royal foot (French) ... 37 Royal Society (British) 46, 47, 84, 99, 101 Ruggles, Samuel B. - - - 126 Ruprecht balance - - - 237 Russia, Weights and measures of 94 Ruthe 82 Salces, Base at - - - -55 Sag^ne 94 Sar 15 Sauvage, Ed. - - - - 183 Saxon weights and measures 30, 31, 32 Schoeuus 23 Schools, Metric system in 125, 129, 165 Schiraz, Anania de - • - 25 Schumacher, Professor - - 248 Screws, Cutting of - - - 182 Screw-cutting lathe - - - 186 Screw threads 182, 183, 184, 185, 186 Seah 21 Second's pendulum 15, 36, 37, 44, 46, 48,49, 111,245 Sellers, Dr. Coleman - -  Sextarii 28 Bbaku 93 8kaw-CbId«pott. W. - 13. 17 8h« 15 fill— t and plate iron and steel, U.S. standard scale - - 131 Shekel. Babylonian - - - 16 Shekels of the Hebrews - - 21 Shilling 32 PAOB Shoppen 83 Short ton 168 Shuckburgh, Sir George 120, 230, 231, 245 Shuckburgh scale - - 1(X) Shuckburffh's comparator - 230, 231 Siemens, Alex. - - 186, 216, 217 Siemens, Werner. - -. 205 Silver coinage by metric weight - 128 Silver voltameter - 210, 211, 212 Sizes of screw threads - - - 184 SkaalPund 96 Smith, Prof. R. H. 