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                            AUTOBIOGRAPHY

                                  OF

                   SIR GEORGE BIDDELL AIRY, K.C.B.,

                M.A., LL.D., D.C.L., F.R.S., F.R.A.S.,

            HONORARY FELLOW OF TRINITY COLLEGE, CAMBRIDGE,
                 ASTRONOMER ROYAL FROM 1836 TO 1881.


                              EDITED BY

                   WILFRID AIRY, B.A., M.Inst.C.E.


                                 1896




PREFACE.

The life of Airy was essentially that of a hard-working, business man,
and differed from that of other hard-working people only in the
quality and variety of his work. It was not an exciting life, but it
was full of interest, and his work brought him into close relations
with many scientific men, and with many men high in the State. His
real business life commenced after he became Astronomer Royal, and
from that time forward, during the 46 years that he remained in
office, he was so entirely wrapped up in the duties of his post that
the history of the Observatory is the history of his life. For writing
his business life there is abundant material, for he preserved all his
correspondence, and the chief sources of information are as follows:

    (1) His Autobiography.
    (2) His Annual Reports to the Board of Visitors.
    (3) His printed Papers entitled "Papers by G.B. Airy."
    (4) His miscellaneous private correspondence.
    (5) His letters to his wife.
    (6) His business correspondence.

(1) His Autobiography, after the time that he became Astronomer Royal,
is, as might be expected, mainly a record of the scientific work
carried on at the Greenwich Observatory: but by no means exclusively
so. About the time when he took charge of the Observatory there was an
immense development of astronomical enterprise: observatories were
springing up in all directions, and the Astronomer Royal was expected
to advise upon all of the British and Colonial Observatories. It was
necessary also for him to keep in touch with the Continental
Observatories and their work, and this he did very diligently and
successfully, both by correspondence and personal intercourse with the
foreign astronomers. There was also much work on important subjects
more or less connected with his official duties--such as geodetical
survey work, the establishment of time-balls at different places,
longitude determinations, observation of eclipses, and the
determination of the density of the Earth. Lastly, there was a great
deal of time and work given to questions not very immediately
connected with his office, but on which the Government asked his
assistance in the capacity of general scientific adviser: such were
the Correction of the Compass in iron ships, the Railway Gauge
Commission, the Commission for the Restoration of the Standards of
Length and Weight, the Maine Boundary, Lighthouses, the Westminster
Clock, the London University, and many other questions.

Besides those above-mentioned there were a great many subjects which
he took up out of sheer interest in the investigations. For it may
fairly be said that every subject of a distinctly practical nature,
which could be advanced by mathematical knowledge, had an interest for
him: and his incessant industry enabled him to find time for many of
them. Amongst such subjects were Tides and Tidal Observations,
Clockwork, and the Strains in Beams and Bridges. A certain portion of
his time was also given to Lectures, generally on current astronomical
questions, for he held it as his duty to popularize the science as far
as lay in his power. And he attended the meetings of the Royal
Astronomical Society with great regularity, and took a very active
part in the discussions and business of the Society. He also did much
work for the Royal Society, and (up to a certain date) for the British
Association.

All of the foregoing matters are recorded pretty fully in his
Autobiography up to the year 1861. After that date the Autobiography
is given in a much more abbreviated form, and might rather be regarded
as a collection of notes for his Biography. His private history is
given very fully for the first part of his life, but is very lightly
touched upon during his residence at Greenwich. A great part of the
Autobiography is in a somewhat disjointed state, and appears to have
been formed by extracts from a number of different sources, such as
Official Journals, Official Correspondence, and Reports. In editing
the Autobiography it has been thought advisable to omit a large number
of short notes relating to the routine work of the Observatory, to
technical and scientific correspondence, to Papers communicated to
various Societies and official business connected with them, and to
miscellaneous matters of minor importance. These in the aggregate
occupied a great deal of time and attention. But, from their detached
nature, they would have but little general interest. At various places
will be found short Memoirs and other matter by the Editor.

(2) All of his Annual Reports to the Board of Visitors are attached to
his Autobiography and were evidently intended to be read with it and
to form part of it. These Reports are so carefully compiled and are so
copious that they form a very complete history of the Greenwich
Observatory and of the work carried on there during the time that he
was Astronomer Royal. The first Report contained only four pages, but
with the constantly increasing amount and range of work the Reports
constantly increased in volume till the later Reports contained 21
pages. Extracts from these Reports relating to matters of novelty and
importance, and illustrating the principles which guided him in his
conduct of the Observatory, have been incorporated with the
Autobiography.

(3) The printed "Papers by G.B. Airy" are bound in 14 large quarto
volumes. There are 518 of these Papers, on a great variety of
subjects: a list of them is appended to this history, as also is a
list of the books that he wrote, and one or two of the Papers which
were separately printed. They form a very important part of his
life's work, and are frequently referred to in the present
history. They are almost all to be found in the Transactions of
Societies or in newspapers, and extend over a period of 63 years (1822
to 1885). The progress made in certain branches of science during this
long period can very fairly be traced by these Papers.

(4) His private correspondence was large, and like his other papers it
was carefully arranged. No business letters of any kind are included
under this head. In this correspondence letters are occasionally found
either dealing with matters of importance or in some way
characteristic, and these have been inserted in this biography. As
already stated the Autobiography left by Airy is confined almost
entirely to science and business, and touches very lightly on private
matters or correspondence.

(5) The letters to his wife are very numerous. They were written
during his occasional absences from home on business or for
relaxation. On these occasions he rarely let a day pass without
writing to his wife, and sometimes he wrote twice on the same
day. They are full of energy and interest and many extracts from them
are inserted in this history. A great deal of the personal history is
taken from them.

(6) All correspondence in any way connected with business during the
time that he was Astronomer Royal is to be found at the Royal
Observatory. It is all bound and arranged in the most perfect order,
and any letter throughout this time can be found with the greatest
ease. It is very bulky, and much of it is, in a historical sense,
very interesting. It was no doubt mainly from this correspondence that
the Autobiography, which so far as related to the Greenwich part of it
was almost entirely a business history, was compiled.

The history of the early part of his life was written in great detail
and contained a large quantity of family matter which was evidently
not intended for publication. This part of the Autobiography has been
compressed. The history of the latter part of his life was not written
by himself at all, and has been compiled from his Journal and other
sources. In both these cases, and occasionally in short paragraphs
throughout the narrative, it has been found convenient to write the
history in the third person.

    2, THE CIRCUS,
        GREENWICH.


                                NOTE.

The Syndics of the Cambridge University Press desire to express their
thanks to Messrs Macmillan & Co. for their courteous permission to use
in this work the steel engraving of Sir George Biddell Airy published
in _Nature_ on October 31, 1878.




                          TABLE OF CONTENTS.

                              CHAPTER I.

Personal Sketch of George Biddell Airy

                             CHAPTER II.

From his birth to his taking his B.A. Degree at Cambridge

                             CHAPTER III.

At Trinity College, Cambridge, from his taking his B.A.  Degree to his
taking charge of the Cambridge Observatory as Plumian Professor

                             CHAPTER IV.

At Cambridge Observatory, from his taking charge of the Cambridge
Observatory to his residence at Greenwich Observatory as Astronomer
Royal

                              CHAPTER V.

At Greenwich Observatory, 1836-1846

                             CHAPTER VI.

At Greenwich Observatory, 1846-1856

                             CHAPTER VII.

At Greenwich Observatory, 1856-1866

                            CHAPTER VIII.

At Greenwich Observatory, 1866-1876

                             CHAPTER IX.

At Greenwich Observatory, from January 1st, 1876, to his resignation
of office on August 15th, 1881

                              CHAPTER X.

At the White House, Greenwich, from his resignation of office on
August 15th, 1881, to his death on January 2nd, 1892

                              APPENDIX.

List of Printed Papers by G.B. Airy, and List of Books written by
G.B. Airy

INDEX.




                              CHAPTER I.

               PERSONAL SKETCH OF GEORGE BIDDELL AIRY.


The history of Airy's life, and especially the history of his life's
work, is given in the chapters that follow. But it is felt that the
present Memoir would be incomplete without a reference to those
personal characteristics upon which the work of his life hinged and
which can only be very faintly gathered from his Autobiography.

He was of medium stature and not powerfully built: as he advanced in
years he stooped a good deal. His hands were large-boned and
well-formed. His constitution was remarkably sound. At no period in
his life does he seem to have taken the least interest in athletic
sports or competitions, but he was a very active pedestrian and could
endure a great deal of fatigue. He was by no means wanting in physical
courage, and on various occasions, especially in boating expeditions,
he ran considerable risks. In debate and controversy he had great
self-reliance, and was absolutely fearless. His eye-sight was
peculiar, and