Autobiography of Sir George Biddell Airy - George Biddell Airy (android based ebook reader txt) 📗

had been accumulated. I had kept them in reasonably good order, tied up in bundles: but this method began to fail in convenience, as the number increased. The great lines of classification were however now well understood. I believe it was in the latter part of the year 1837 that I finally settled on the principle of arranging papers in packets and subordinate packets, every paper being flat, by the use of four punched holes in every paper. I have never seen any principle of arrangement comparable to this. It has been adopted with the greatest ease by every assistant, and is used to the present time (1871) without alteration.

"On Jan. 3rd I was informed unofficially by Mr Wood (Admiralty Secretary) that the addition of the Magnetic Ground was sanctioned. On Feb. 16th Mr Rhodes (an officer of the Department of Woods and Works) came to put me formally in possession of the ground. Between Apr. 26th and May 13th the ground was enclosed, and my garden was completely protected from the public. The plan of the building was settled, and numerous experiments were made on various kinds of concrete: at last it was decided to build with wood.

"After a dinner given by Lord Burlington, Chancellor, the first meeting of the London University was held on Mar. 4th, and others followed. On Apr. 18th I handed to the Chancellor a written protest against a vote of a salary of _L1000_ to the Registrar: which salary, in fact, the Government refused to sanction. Dissensions on the question of religious examination were already beginning, but I took little part in them.

"In 1833 Mr Henderson had resigned the superintendance of the Cape of Good Hope Observatory, and Mr Maclear was appointed. I recommended the same Official Instructions for him (they had included an allusion to La Caille's Arc of Meridian) with an addition on the probability of Trigonometrical Survey, on Aug. 8th, 1837. On Feb. 24th, 1837, I wrote to Beaufort suggesting that Bradley's Sector should be used for verifying the astronomical determinations, and subsequently received the approval of the Admiralty. In June Sir J. Herschel and I had an interview with Mr Wood on the Cape equipment generally. The Sector was erected with its new mounting, careful drawings were made of every part, instructions were prepared for its use, and on Aug. 10th it was sent to Woolwich Dockyard and shipped for the Cape.

"Of private history: On Aug. 23rd I started with my wife for an excursion in South Wales, &c. On Sept. 9th I gave a lecture in the Town Hall of Neath. While at Swansea we received news of the death of my wife's father, the Rev. Richard Smith, and returned at once.--In this year Arthur Biddell bought the little Eye estate for me."


1838

"Cambridge Observatory:--On Dec. 29th, 1837, I had set Mr Glaisher to work in collecting the annual results for star-places from the Cambridge Observations, to form one catalogue: I examined the calculations and the deduced catalogue, and on Dec. 14, 1838, presented it to the Royal Astronomical Society, under the title of 'The First Cambridge Catalogue.'--For the Northumberland telescope I was engaged with Simms about the clockwork from time to time up to Apr. 30th, and went to Cambridge about it. The instrument was brought to a useable state, but some small parts were still wanting.

"At Greenwich:--In April I drew up a little history of the Observatory for the Penny Cyclopaedia.--On June 30th the Lords of the Admiralty paid a short visit to the Observatory: on this occasion Mr Wood suggested a passage connecting the Observatory with the dwelling-house, and I subsequently prepared sketches for it; it was made in the next year.--In the course of the year the Sheepshanks Equatoreal was mounted, and Encke's Comet was observed with it from Oct. 26th to Nov. 13th.--On Mar. 31st, &c. I reported to the Admiralty on the selection of chronometers for purchase, from a long list: this was an important beginning of a new system.--The Magnetic Observatory was built, in the form originally planned for it (a four-armed cross with equal arms, one axis being in the magnetic meridian) in the beginning of this year. (No alteration has since been made in form up to the present time, 1871, except that the north arm has been lengthened 8 feet a few years ago.) On May 21st a magnet was suspended for the first time, Mr Baily and Lieut. (afterwards Sir William) Denison being present.--Groombridge's Catalogue was finished, and on Mar. 3rd I arranged for sending out copies.--The Planetary Reductions were carried on vigorously. On May 31st, 1838, the Treasury assented to the undertaking of the Lunar Reductions and allotted _L2,000_ for it: preparations were made, and in the autumn 7 computers were employed upon it. It will easily be seen that this undertaking added much to my labours and cares.--The geodetic affairs of the Cape of Good Hope began to be actively pressed, and in February Beaufort wrote to me in consequence of an application from Maclear, asking about a standard of length for Maclear (as foundation for a geodetic survey). I made enquiries, and on Mar. 13th wrote to Mr Wood, alluding also generally to the want of a National English standard after the destruction of the Houses of Parliament. On Apr. 24th the Admiralty sanctioned my procuring proper Standard Bars.--In connection with the Cavendish Experiment, I have an immense quantity of correspondence with Mr Baily, and all the mathematics were furnished by me: the experiment was not finished at the end of the year.--The Perturbations of Uranus were now attracting attention. I had had some correspondence on this subject with Dr Hussey in 1834, and in 1837 with Eugene Bouvard. On Feb. 24th, of 1838, I wrote to Schumacher regarding the error in the tabular radius-vector of Uranus, which my mode of reducing the observations enabled me to see.

"The National Standards of Length and Weight had been destroyed in the fire of the Houses of Parliament. On May 11th I received a letter from Mr Spring Rice, requesting me to act (as chairman) with a committee consisting of F. Baily, J.E. Drinkwater Bethune, Davies Gilbert, J.G.S. Lefevre, J.W. Lubbock, G. Peacock, and R. Sheepshanks, to report on the steps now to be taken. I accepted the charge, and the first meeting was held at the Observatory on May 22nd; all subsequent meetings in London, usually in the apartments of the Royal Astronomical Society. I acted both as chairman and as working secretary. Our enquiries went into a very wide field, and I had much correspondence.

"On Jan. 4th Mr Wood wrote to me, mentioning that Capt. Johnson had made some observations on the magnetism of iron ships, and asking whether they ought to be continued; a steamer being offered at _L50_ per week. I applied to Beaufort for a copy of Johnson's Observations, and on Jan. 7th replied very fully, discouraging such observations; but recommending a train of observations expressly directed to theoretical points. On Feb. 17th I reported that I had examined the Deptford Basin, and found that it would do fairly well for experiments. On July 14th, 1838, Capt. Beaufort wrote to me that the Admiralty wished for experiments on the ship, the 'Rainbow,' then in the river, and enquired whether I would undertake them and what assistance I desired, as for instance that of Christie or Barlow. I replied that one person should undertake it, either Christie, Barlow, or myself, and that a basin was desirable. On July 16th and 17th I looked at the basins of Woolwich and Deptford, approving the latter. On July 21st the Admiralty gave me full powers. From July 23rd I was almost entirely employed on preparations. The course of operations is described in my printed Paper: the original maps, curves, and graphical projections, are in the bound MSS.: 'Correction of Compass in Iron Ships--"Rainbow,"' at the Greenwich Observatory. The angular disturbances were found on July 26th and 30th, requiring some further work on a raft, so that they were finally worked out on Aug. 11th. I struggled hard with the numbers, but should not have succeeded if it had not occurred to me to examine the horizontal magnetic intensities. This was done on Aug. 14th, and the explanation of the whole was suggested at once: graphical projections were made on Aug. 16th and 17th for comparison of my explanation with observations, and the business was complete. On Aug. 17th and 18th I measured the intensity of some magnets, to be used in the ship for correction. It is to be remarked that, besides the effect of polar magnetism, there was no doubt of the existence of an effect of induced magnetism requiring correction by other induced magnetism: and experiments for this were made in the Magnetic Observatory. All was ready for trial: and on Aug. 20th I carried my magnets and iron correctors to Deptford, mounted them in the proper places, tried the ship, and the compass, which had been disturbed 50 degrees to the right and 50 degrees to the left, was now sensibly correct. On Aug. 21st I reported this to the Admiralty, and on Aug. 24th I tried the ship to Gravesend. On Aug. 30th I had the loan of her for an expedition with a party of friends to Sheerness, and on Sept. 9th I accompanied her to Gravesend, on her first voyage to Antwerp.--On Oct. 5th application was made to me by the owner of the 'Ironsides' to correct her compasses. In consequence of this I went to Liverpool on Oct. 25th, and on this occasion made a very important improvement in the practical mode of performing the correction.--On Nov. 16th I reported to the Admiralty in considerable detail. On Dec. 4th I had an interview with Lord Minto (First Lord of the Admiralty) and Mr Wood. They refused to sanction any reward to me.--The following is a copy of the report of the Captain of the 'Rainbow' after her voyage to Antwerp: 'Having had the command of the Rainbow steamer the two voyages between London and Antwerp, I have the pleasure to inform you that I am perfectly satisfied as to the correctness of the compasses, and feel quite certain they will continue so. I took particular notice from land to land from our departure and found the bearings by compass to be exact.'"--The following extracts from letters to his wife refer to the "Ironsides": on Oct. 28th 1838 he writes, "I worked up the observations so much as to see that the compass disturbance is not so great as in the 'Rainbow' (35 deg. instead of 50 deg.), but quite enough to make the vessel worthless; and that it is quite different in direction from that in the 'Rainbow'--so that if they had stolen one of the 'Rainbow' correctors and put it into this ship it would have been much worse than before." And on Nov. 1st he writes, "On Wednesday I again went to the ship and tried small alterations in the correctors: I am confident now that the thing is very near, but we were most abominably baffled by the sluggishness of the compass."

"The University of London:--On Jan. 6th I attended a sub-committee meeting on the minimum of acquirements for B.A. degree, and various meetings of the Senate. On July 14th I intimated to Mr Spring Rice my wish to resign. I had various correspondence, especially with Mr Lubbock, and on Dec. 13th I wrote to him on the necessity of stipends to Members of Senate. The dissensions on religious examination became very strong. I took a middle course, demanding examination in the languages and books,