Time measuring instruments
Found in 5 Collections and/or Records:
'An Account of the going of Dr Maskelyne's new Chronometer N.309 made by Mr T. Earnshaw', 1799 - 1811
Also contains results for 'A continuation of the trial of the late Dr. Postlethwaite's watch' from 12 August - 30 September 1799.
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.
Observations on the workings of John Harrison's time-keeper, in two parts.
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.
The UK Archival Thesaurus has been integrated with our catalogue, thanks to Kings College London and the AIM25 project for their support with this.