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 Correspondence between the Hydrographer of the Navy, Sir Frank Dyson and Lieutenant-Commander R.T. Gould on the following subjects:1. The Astronomer Royal's permission for Gould to see the Board of Longitude papers.2. The preparation of Gould's book 'The Marine Chronometer'.3. The cleaning and repair of Harrison 1, 2, 3 and 4 by Gould, including a list of notebooks and papers relating to the Harrison chronometers which Gould presented to the National Maritime...

Scope and Contents Miscellaneous correspondence concerning chronometers:Letter from Yarrow and Co. Ltd requesting that Lieutenant J. Znierkonski be granted permission to compare the rates of chronometers belonging to two Austrian torpedo boats, 'Huzar' and 'Kaiman', at the Royal Observatory, 1905.Telegram from the Navigating Officer of HMS 'Victoria and Albert' requesting information on chronometer error and Greenwich Mean Time, 1905.Correspondence with the Naval Store Officer...

Scope and Contents Correspondence concerning chronometers, including a ledger titled 'Instructions and precedents relating to the Time and Chronometer Branch', containing letters and instructions regarding chronometers; correspondence relating to a water clock, with a map of the water supply to the clock; and correspondence with Lieutenant-Commander R.T. Gould on the repair, cleaning, insurance, exhibition and storage of the John Harrison chronometers, Nos 1, 2, 3 and 4, with a reprint of an article by Gould...

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Extracts from the Minutes of the Board of Longitude, including the findings on John Harrison's chronometers.

Scope and Contents Photostats of a manuscript written by John Harrison in 1730 concerning the construction of his first marine chronometer. The document describes the problem of finding longitude at sea, the solution of using a marine timekeeper, the accuracy of contemporary clocks, errors in pendulum regulators and their correction, and the effects of temperature on clocks. It continues with notes on the construction of Harrison's chronometer, including the theory employed and compensations introduced. There...

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Presentation pack containing four stamps of John Harrison’s Marine Timekeeper No.4 (24p, 28p, 33p and 39p) and a Harrison information sheet.

Also, first day cover with printed images of Harrison and a ship at sea; the four 'Marine Timekeepers’ stamps are affixed and postmarked by the British Philatelic Bureau, Edinburgh.

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The draft letter is addressed to 'My Lord' and is a response to John Harrison's applications to the Board of Longitude and to Parliament to get a second £10,000 in reward money for his marine timekeepers. The letter continues with notes on longitude determination and marine timekeepers by other makers.

Scope and Contents Bound extracts from 'The Observatory', No. 687, August 1931, pp. 213-216; No. 699, August 1932, p. 236; and No. 709, June 1933, pp 193-196, regarding John Harrison's chronometers. In a pocket at the front of the booklet are postcard photographs of Harrison's first, second and third marine timekeepers, and various letters to Melotte dated 1942-1948. In a pocket at the back are five photographs of Harrison's timekeepers and of a copy by Larcum Kendall, and a letter from Kathleen Melotte, 26...

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'Notes on the Ownership of John Harrison's Timekeepers', a 9-page typescript by R.T. Gould, dated at the end 10 May 1937.

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Observations on the workings of John Harrison's time-keeper, in two parts.

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Observations and comparisons during the trials of John Harrison's chronometers (H1, H2, H3 and H4) and Kendall I, with mean solar time, 1766-1767, and the rating of the Royal Observatory transit clock, 1771. The volume is comprised largely of tables of measurements, with some descriptions of how the results were achieved.