Earnshaw, Thomas, 1749 - 1829 (maker of watches and chronometers)
Found in 130 Collections and/or Records:
Report by Lord Hugh Seymour on timekeepers put on board the HMS Sans Pareil, 1796-08-16
Includes accounts of the rates of his chronometers Green and Blue, as tried at the Royal Observatory, reports outlining objections to his petition, and seven letters.
Reports by the Astronomer Royal, 1783 - 1809
Reports from Nevil Maskelyne on the merits of petitions submitted to the Board of Longitude. Most of the petitions are concerned with various methods of discovering longitude at sea. Includes a report titled 'Remarks on Mr Earnshaw's Petition', and a list of Charles Mason's papers presented to the Board of Longitude.
Sketches of islands 'discovered', rough calculations and tables, 1791 - 1792
Set of rough astronomical calculations, with tables, notes, and sketches of islands ‘discovered’; the islands are unnamed, although reference points are sometimes given, such as ‘Island A’ [RGO 14/62: 141*v], or ‘Bay at C’ [RGO 14/62: 79v]. Interspersed among the notes are occasional doodles by Gooch [RGO 14/62: 88v], [RGO 14/62: 124r], and translations of [Polynesian] words [RGO 14/62: 124r], [RGO 14/62: 126-127], [RGO 14/62: 141*v].
Some pages are inverted in the volume.
Summaries of observations made between December 1801 and July 1802, 1801-12-12 - 1802-07-18
Includes accounts of the rates and errors of the timekeepers by Earnshaw and Arnold, and summaries of observations to determine longitude made in Princess Royal Harbour, at Bay 10, in Port Phillip Bay and at Cattle Point on the east side of Sydney Cove, Port Jackson.
Table comparing the rate of Thomas Cumming's chronometer with those by Earnshaw and others, 1822
Tables and notes on the rate of a chronometer by Thomas Cumming which was tested at the Royal Society and Royal Observatory, Greenwich; with three related letters from C.G. Briscoe and Cumming.
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