Time measuring instruments
Found in 103 Collections and/or Records:
The Royal Observatory Admiralty chronometers account book recording payments made to chronometer makers.
Admiralty papers sent to Pond concerning the fitting out of H M Ships with chronometers.
'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.
Nine exercise books bound together, containing the rating of chronometers and watches.
Captain Cook's journal of his voyage to the South Seas, including observations of variation of the compass and observations for chronometer rates.
Thomas Henderson's comparisons of chronometers with the transit clock. There are also observations of Encke's Comet, times of flash of the evening gun, and weather observations.
A chronometer ledger for 1807-1825, with three additional entries dated 1835. The ledger records the ship each chronometer was supplied to, the officer in charge of the chronometer, the dates it was lent and returned, and to whom it was returned.
A printed account of the daily rates of chronometers on trial at the Royal Observatory between March 1823 and February 1836. All the years except 1834 are incomplete.
Printed accounts of the weekly sums of the daily rates of chronometers selected for purchase by the Admiralty and on trial at the Royal Observatory between August 1840 and August 1865, including an abstract of the principal changes of rate. The item for 1842 and 1843 includes an appendix to the report.
Printed accounts of the rates of chronometers on annual trial at the Royal Observatory with a view to purchase by the Admiralty, 1866 and 1887-1889.
Printed accounts of the rates of chronometers on annual trial at the Royal Observatory between the months of July to January in the years 1889-1904 and between June to January during 1904-1908, with a view to their purchase by the Admiralty.
Printed accounts of the rates of box and pocket chronometers on annual trial at the Royal Observatory during 1908-1914 with a view to their purchase by the Admiralty. There are annual rates for box chronometers during June-January and for pocket chronometers during August-November.
Printed account of the rates of box chronometers on trial at the Royal Observatory during June 1914 to January 1915 with a view to their purchase by the Admiralty.
Committee papers, relating chiefly to the measurement of ships' tonnage, and reports by the Astronomer Royal.
A comparison of Arnold, Kendall and Grignion's chronometers on board HMS Carcass.
Correspondence regarding the disposal of a quartz crystal clock, which was removed from Germany after the Second World War as part of the German reparations.
Correspondence with Sir Howard Grubb, Parsons and Co. Ltd and the Etablissements Edouard Belin regarding the Belin printing chronograph.
Correspondence regarding the Belin printing chronograph, 1950, and a copy of a letter from the Astronomer Royal to H. Wetzer, Germany, reporting on the performance of two chronographs, 1938.
Correspondence with the Etablissements Edouard Belin, Paris, regarding the Belin Printing Chronograph, including a report on the chronograph by H. Spencer Jones, 1953, and a 'Report on the Inspection Of The Observatory's Printing Chronograph at Establissement Belin At Paris' by J.D. Pope, 23 May 1952.