Scope and Contents Letters to Thomas Maclear from F.H. Aspin; the Colonial Office; the Washington Naval Observatory; William Bond of London; the Meteorological Office; C.D. Fischer; F.T. Read; T. Risler; C. Bell; L. Adamson; I.M. Grant; A. de Schmidt; the Cape Telegraph Office; R. Noble; I.A. Thwaits; R.D. Hodgson; H. Waltham; W. Stow; [W.] Freeman; H. Richards; the Perth Observatory; Creichton Bell; F.C. Dick; T. Kyd; W. Roberts; and Der Commission für die Vorberathung de für die Beobachtung des...

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Letters to Thomas Maclear from various individuals regarding the trigonometric survey and the issue of chronometers, with letters of introduction to Maclear. There are also letters concerning the topography of the Cape Colony, 7 March 1857; Cape Point Lighthouse, 26 July 1857; a report on an earthquake, 20 October 1857; the memorial to Thomas Holden Barker, 4 July 1858; and a report on Dr Livingstone, 10 November 1858.

Scope and Contents Letters to Thomas Maclear regarding time balls, time signals and cooperation with the telegraph company, including the following items: Letter on the time signal at Simon's Bay, 31 May 1861.Letter on the problems concerning the time ball at Lion's Rump, 10 August 1861.A pamphlet on W.T. Henley's Patent Magneto-Electric Alphabetic Telegraph, December 1862.Copies of correspondence between the Cape Observatory and the Agent of the Cape Electric Telegraph,...

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Correspondence with J.R. Hind concerning the 'Nautical Almanac', regarding the adoption of Le Verrier's tables, ephemerides of small planets, solar eclipses of 1866 and 1868 (with a map for the latter) and errors in the work. There are various requests for data on the Moon's culminations and places, including one on behalf of D. Livingstone. Other correspondents include E.J. Stone, U.J.J. Le Verrier, A. Laussedat, J.J. von Littrow, T. Maclear and A.C. Campbell.

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Observations and miscellaneous computations by Thomas Maclear comprised mostly of theodolite readings for the Arc of Meridian.

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Observations and miscellaneous notes by Thomas Maclear, including observations of Halley's Comet.

Scope and Contents The journal of Thomas Maclear containing frequent observations of the phenomena of Jupiter; lunar occultations of stars and planets; observations of lunar and solar eclipses, sunspots, Mars and meteors; records of thermometer and barometer readings; and general remarks on the weather. There are observations of Halley's Comet for September 1835 to March 1836, with many pen and ink sketches and notes on the appearance and growth of the tail. There are also references to Encke's Comet and an...

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Airy's official and scientific correspondence, volume 1, including letters from Amici, Baily, Beaufort, Bouvard, Brewster, Carlini, Cerquene, Colby, Davy, Gambart, Garvey, Gilbert, Hamilton, Herschel, Hudson, Hussey, Jenkins, Lardner, Lax, Maclear, Pearson, Pond, Rigaud, Robinson, Rumker, Sabine, Sanchis, Schumacher, South, Stratford and Young, with an index to the correspondents at the end. There are a few letters in French and Italian.

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Airy's official and scientific correspondence, volume 2, including letters from Arago, Auber, Baily, Barrow, Beaufort, Becker, Cooper, De Morgan, Encke, Forbes, Foster, Gambert, Gilbert, Gregory, Hamilton, Harcourt, Henderson, Herschel, Hudson, Hussey, Inman, Innes, Lax, Lubbock, Maclear, Princess Olive, Parrot, Pearson, Quetelet, Robinson, Schumacher, Sheepshanks, Stratford, Taylor, Tiarks and Tyson, with an index to the correspondents at the end. There are a few letters in French.

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Carbon copies of letters sent by Thomas Maclear between July 1844 and January 1846, including letters to the Admiralty, G.B. Airy, Gibbs, local army officers and civic dignitaries. There are also instructions for the heliotrope and on telegraphic communications.

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Carbon copies of letters from Thomas Maclear to G.B. Airy, Gibbs and Nicholson; instructions; and an 'Account of Malady' dated 18 April 1847.

Scope and Contents 2. Cape observations (continued).2/13. 'Star Magnitudes. Trial List', including later workings on star magnitudes running from the end.2/14. Lists of stars ordered according to observed magnitudes, 1835-1838 and 1839-1840, and some miscellaneous observations.2/15. Papers entitled 'Plans &c of the Equatorial Instrument & Revolving Roof. For the Cape'.2/16.1. Guard Book, Vol. III: drawings of nebulae, comets and the Southern Milky Way. With a few...

Scope and Contents 5. Star magnitudes, Cape of Good Hope.5/1. Observations entitled 'Star-magnitudes. Original Observed Lists. Booked', 1836-1841.5/2. 'Chap. IV. Astrometry of The Magnitudes of the Stars.'5/2.1. Notes and calculations entitled 'Photometry Astromet[r]y', including a letter to Herschel from Hugh, 3rd Duke of Northumberland, 30 October 1840.5/2.2. 'Magnitudes of the Stars from actual observation', covering observed sequences of 1835-1841.5/2.3. Notes...

Scope and Contents Correspondence and related papers concerning the correction of compasses on iron ships. There are papers regarding investigations of compass deviation on the 'Trident'; the work and findings of the Liverpool Compass Committee; changes in the deviation of iron ships' compasses; 'Notes on the arrangements and practice of adjusting the compasses of iron ships at Liverpool'; Dr W. Scoresby's account of the voyage of the 'Royal Charter'; compasses of the 'Great Eastern', with ratings of the...

Scope and Contents Papers relating to the publication of a paper by Airy on the establishment of the Northumberland telescope at the University Observatory, Cambridge. There is an essay giving a description of the dome and telescope, and correspondence with engravers, artists and printers for the paper's publication. The correspondence includes letters of thanks for the work from J. Challis, W.H. Miller, W.S. Stratford, G. Bishop, G. Fisher, W.R. Dawes, E. Sabine, Sir F. Beaufort, S.H. Christie, M.J. Johnson,...

Scope and Contents Correspondence and other papers regarding the acquisition of moveable property by the Royal Observatory, including the following:Correspondence with A. Cowper Ranyard, S. Denman, W. Spottiswoode and S. Crompton, who sent various photographs to Sir George Airy, 1875-1876.Correspondence with J.P. Maclear and the Admiralty concerning the return of a spectroscope which the Royal Observatory had loaned to Maclear, 1876.Copy of a letter from Airy to Lord Lindsay thanking...

Scope and Contents Miscellaneous papers relating to the Royal Astronomical Society, including notices of meetings; agenda for the Council meetings; balloting lists for officers; correspondence regarding the lecture on O. Struve's 'Etudes' and the Pulkova Observatory; the results derived from Cambridge observations of occultations, 1830-1835; correction to lunar elements from Greenwich observations, 1750-1830; a lecture upon Lord Rosse's and W. Lassell's telescopes; U.J.J. Le Verrier's paper on periodical...

Scope and Contents Papers relating to the Royal Astronomical Society, including a paper by Airy on the origin of the apparent luminous band which in partial eclipses of the Sun has been seen to surround the visible portion of the Moon's limb; a note on the division of labour in the observation of small planets; a paper by Airy on the transit of Venus, 1882; a paper by Airy on a comparison of the Chinese record of solar eclipses in the Chun Tsew with the computations of modern theory; a paper by Airy on a...

Scope and Contents Papers relating to the Royal Astronomical Society, including papers by Airy on the value of the Moon's semidiameter; the supposed possible effect of friction in the tides in influencing the apparent acceleration of the Moon's mean motion in longitude; a method of computing interpolations to the second order without changes of algebraic sign; Abraham Sharpe's quadrant; a meteor shower of November 1866; the simultaneous disappearance of Jupiter's satellites in the year 1867; certain...

Scope and Contents Correspondence of David Gill and related papers regarding the determination of the Cape-Aden longitude. The correspondence includes letters on the need for a determination of Aden's longitude, the delays caused by lines being brought down and political problems. There are also many telegrams exchanged between T. Maclear and D. Gill regarding delays caused by bad weather. The volume ends with a number of Admiralty charts of harbours and estuaries on the east coast of Africa. There is an index...

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The volume begins with the 'Report of Thomas Maclear ... her Majesty's Astronomer at the Cape of Good Hope, to the Lords Commissioners of the Admiralty, July 23, 1850', regarding the Cape Observatory (pp. 1-30). This is followed by other papers by Maclear concerning the observatory's work (pp. 31-114). The contents were reprinted from the 'Monthly Notices of the Royal Astronomical Society', Vol. XX.

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Official correspondence and rough and neat minutes of the Standards Commission, with summons to meetings. The volume includes all correspondence on the distribution of the standards authenticated by Act of Parliament, the changing of the manner of charging the customs duties from per 112 lbs to 110 lbs, and correspondence with the Treasury on accounts and printing. There are also letters from astronomers, including Sir J.F.W. Herschel, J.F. Encke and T. Maclear.

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Sent by Francis Beaufort to John Pond.

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A printed copy of Volume I of the 'Astronomical Observations' made at the Cape during the year 1834, prepared by Thomas Maclear.

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Papers relating to the Royal Astronomical Society's transactions with the Government, including correspondence on the transfer of the 'meridian ephemeris' to the Admiralty; the printing of T. Henderson's Edinburgh observations; the printing of T. Henderson's and T. Maclear's Cape papers; and F. Baily's reproduction of Cavendish's experiment.