Scope and Contents The log covers the period from 13 November 1763 - 15 August 1764, and includes observations of stars and planets and errors and adjustments to instruments and clocks. It mentions the arrival of John Harrison and his chronometers on board HMS 'Tartar' on 13 May 1764 [RGO 4/323: 15v], and includes ratings for these chronometers [RGO 4/323: 15v-16v]. The log also includes details of how and when the astronomer conveyed copies of his observations to Sir Philip Stephens, using different ships...

Scope and Contents From the Series: The collection comprises a large series of observations, calculations, computations and tables, with accounts, booklets, illustrations, journals of voyages, notes, treatises and other material. There is a large volume of correspondence, which reflects the varied nature of the Astronomer Royal's work, and includes correspondence with computers and comparers; letters from Gauss, Piazzi, Zach and Olbers, who contacted Maskelyne at the time of the discovery of the minor planets; and...

Scope and Contents Copies of letters written by Lady Clive to her brother Nevil Maskelyne (three letters dated 1775) and to Edmund Maskelyne (one letter dated 1766); originals are in the volume catalogued at RGO 218/9/1. Also, copies of two letters from Nevil Maskelyne to his brother Edmund (29 Dec. 1763, written from Barbados describing his observatory and experiences) and to Anthony Shepherd (written 15 Oct. 1764 on his return from Barbados, reporting his observations and thanking him for notification of the...

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The undated draft letter concerns the eclipses of Jupiter's satellites and the deduction of longitude from observations made on board HMS Princess Louisa during a voyage to Barbados. Maskelyne mentions his inability to make these observations from either of Christopher Irwin's marine chairs, which he had been asked by the Commissioners of the Board of Longitude to use and give an opinion on. On the reverse are observations made by Maskelyne whilst in Barbados.

Scope and Contents The journal covers the period 23 February-7 November 1763 and consists of daily tabulated log entries showing the course of the ship and meteorological conditions on the voyage.A set of additional pages is loosely inserted [RGO 4/321: 14-20], showing a sketch of an unnamed island, possibly Barbados [RGO 4/321: 14], and various computations [RGO 4/321: 15-20] including comparisons of observations from voyages of 1761-1764 to ascertain errors in the quadrant [RGO 4/321: 15]; observations...

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Letter containing observations of the stars and Jupiter's satellites to determine the longitude of Barbados.

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A log book by Maskelyne of a voyage to Barbados, split into three parts.

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A record of observations at sea with calculations and notes, including notes on observations of Jupiter's satellites and on his chronometers during his voyage to Barbados [to test John Harrison's chronometer H4].

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Prose notes describing the workings of the time-keeper, with comments on making adjustments to it and on its accuracy.