Scope and Contents Letters to Thomas Maclear from the Colonial Office regarding work to be carried out at the Cape Observatory, time balls, surveys, lighthouse and financial matters. The letters include the following items:News of Dr Livingstone, 3 April 1861.A list of instruments used for the Cape Coast Survey, 31 January 1862.A report on Captain Bailey's completion of general triangulation work, 18 February 1863.Comments on the proposed changes in the Table Bay Lights, 17...

Scope and Contents Letters to Thomas Maclear from various individuals regarding the fire at the Magnetic Observatory and its subsequent reconstruction. There are also letters from Mr Mann regarding instructions from the Admiralty to Maclear on the purchase of a new telescope and concerning other matters at the Royal Observatory, Greenwich; requests from individuals for observations and the loan of various items of equipment; correspondence regarding lighthouse positions, 26 February 1833; and a letter from...

Scope and Contents Letters to Thomas Maclear on a range of matters, including problems with the Port Elizabeth Time Ball, with some related papers. There is a letter from H. Read on irregularities in the time of dropping of the time ball, 9 February 1866, and regular reports from that date; information on Bailey's survey; observations of Earth currents on telegraph lines between Cape Town and Port Elizabeth and Simon's Bay, 4 April 1867; various reports of sightings of a meteoric shower, 1867; an estimate from...

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Letters to Thomas Maclear concerned mainly with the telegraph and related apparatus, including batteries. Parts of some of the letters are damaged, rendering the text unreadable.

Scope and Contents Correspondence comprised predominantly of letters from T. Maclear or F. Fallows to F. Baily:A letter from Maclear to Baily concerning methods of calculating longitudes, 1828, including mention of C. Babbage and T. Young.A letter from Maclear to Baily, 1835, concerning the publication of Cape observations by Fallows and Maclear; the accuracy of the transit clock; the expansion of the Cape Observatory; observations of Halley's Comet, 1-24 September 1835; C. Piazzi Smyth's...

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Letters to Thomas Maclear from W.S. Jacob and C.P. Smyth, mainly of a personal nature. The letters include a set sent by Smyth to Maclear while he was absent from the Cape Observatory performing observations for the Arc of the Meridian and Cape Survey. These include carbon copies of Maclear's instructions for further work to be done. There are also printed publications of the 1849 meeting of the 'Entomological Society of London' and on the 'Akbar Frigate'.

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Measurements by Thomas Maclear of the angle of triangulation of a chain of points along the arc of a meridian, with an index at the beginning containing the names of the stations at which the observations were made.

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Measurements by Thomas Maclear of the angle of triangulation of a chain of points along the arc of a meridian, with an index at the beginning containing the names of the stations at which the observations were made.

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Measurements by Thomas Maclear of the angle of triangulation of a chain of points along the arc of a meridian, with an index at the beginning containing the names of the stations at which the observations were made.

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Measurements by Thomas Maclear of the angle of triangulation of a chain of points along the arc of a meridian, with an index at the beginning containing the names of the stations at which the observations were made.

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Measurements by Thomas Maclear of the angle of triangulation of a chain of points along the arc of a meridian, with an index at the beginning containing the names of the stations at which the observations were made.

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Measurements by Thomas Maclear of the angle of triangulation of a chain of points along the arc of a meridian, with an index at the beginning containing the names of the stations at which the observations were made.

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The private meteorological register of Thomas Maclear.

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An undated microfilm made by the Public Record Office of correspondence of the Royal Observatory, Cape of Good Hope: RGO 15/27, correspondence of Fearon Fallows and Thomas Henderson, 1820-1833, and RGO 15/30, correspondence of Henderson, G.B. Airy and Thomas Maclear, 1832-1842.

Scope and Contents (1) Letters regarding the existence of Neptune, 1846-1878Duplicate copies of collected correspondence on the investigations of J.C. Adams and U.J.J. Le Verrier into the existence of Neptune and in particular of the ensuing controversy over the name of the planet. There are also other letters concerning the minor planets and mathematical formula for their orbits, the Moon's equation and lunar acceleration. The correspondents include J.C. Adams, Sir George Airy, F.N.M. Arago, J....

Scope and Contents Airy's miscellaneous correspondence, letters L-W. The correspondents include, among others, J. Lee, U.J.J. Le Verrier, T. Maclear, F. Maxwell, C. May, W.H. Miller, O.M. Mitchel, J.P. Nichol, G. Peacock, C.H.F. Peters, F. Petit, Mr Plarr, C. Pritchard, L.A. Quetelet, W. De La Rue, E. Sabine, G.S.G. Santini, P.A. Secchi, Miss Sheepshanks, W.H. Smyth, C.P. Smyth, F.G.W. Struve, J. Tyndall and W. Whewell. The papers include a printed circular on Madame Quetelet's death; circulars advertising...

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Letters to Thomas Maclear from Timms, Gibbs, F. Baily, Taylor, G. Dolland, the Academy of Science in Paris and G.B. Airy regarding Halley's Comet, the printing of observations, instrument problems and their solution and other subjects.

Scope and Contents Letters to Thomas Maclear on a variety of subjects, including requests for chronometers; requests for sets of observations and publications; instructions for work to be carried out; observations made at Williamstown, Victoria, 16 November 1859; work on the weights and measures bill; and accounting matters. There are also letters from the Admiralty referring to the renewal of the transit clock, 9 April 1857, and a printed notice on the 'Revolving Light on the Cape of Good Hope', 2 April...

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...