Correspondence concerning the annual trials of chronometers and watches at the Royal Observatory:

Table showing the greatest change in rate, from one week to the next, of various chronometers during the annual trials of 1856-1880, compiled 1885.

Correspondence concerning the annual trial of chronometers, 1885, including a rough abstract on the chronometer trial of that year, a letter of withdrawal from the horologist W.G. Schoof, a list of chronometers entered in the trial, a list giving the results in order of merit, and a list of trial chronometers that have been purchased by the Admiralty.

Correspondence concerning the annual trial of chronometers, 1886, including a rough abstract on the trial of that year, a list giving the results in order of merit, rough calculations, and a list of chronometers purchased by the Admiralty.

Correspondence concerning the alteration of the date of the annual trial of chronometers and the establishment of an annual trial for deck watches, 1886.

Correspondence concerning the trial of deck watches, November 1886, including a draft and printed notice of the trial, a written scheme for testing deck watches, a list of deck watches purchased by the Admiralty in March 1885, letters from W.G. Schoof, and the 'Jeweller and Metalworker' papers showing weekly rates of deck watches on trial.

Correspondence concerning a supplementary trial of deck watches, January-April 1887, and a supplementary trial of chronometers, March-June 1887, including letters from the watchmakers Leonard Hall, W.G. Schoof and H.P. Isaac.

Correspondence concerning the annual trial of chronometers, 1887, including correspondence with W.G. Schoof, a rough abstract of the chronometer trial of 1887, a letter from the watchmakers David Glasgow Jnr and David Reid, and the names of chronometers purchased by the Admiralty.

Correspondence concerning the annual trial of deck watches, November 1887 - February 1888, including correspondence with the watchmaker J. Player.

Correspondence concerning the annual trial of chronometers, July 1888 - February 1889, including correspondence with Brockbank, Atkins and Moore, and F.J. Britten. There is also a rough abstract of the chronometer trial of 1888 and a list of the results in order of merit.

Correspondence concerning the annual trial of deck watches, November 1888 - February 1889, including correspondence with J. Player, H.P. Isaac and David Glasgow Jnr.

Correspondence concerning the annual trial of chronometers, 1889-1890, including a table of the chronometer rates of the first and second day of the trial, a rough abstract of the chronometer trial of 1889, a list of results in order of merit, and a letter from the manager of the 'Jeweller and Metalworker'.

Correspondence concerning the trial of deck watches, 1889-1890, including a letter from Howard White, Upjohn and Bright, watchmakers, and a table of errors for keyless watches.

Correspondence with the Hydrographer of the Navy concerning arrangements for the annual trial of chronometers, 1890.

Copies of correspondence and tables giving the participants of the annual chronometer trial the official results in order of merit and a rough abstract on the trial and the chronometers purchased by the Admiralty, 1890-1891.

Correspondence concerning the trial of chronometers, 1890, including correspondence with the watchmakers Whyte, Thompson and Co.; Frederick Rotig, Usher and Co.; and H.P. Isaac.

Copies of letters to the Hydrographer of the Navy, 1890-1891, from the editor of 'Watchmaker, Jeweller and Silversmiths' and the editor of the 'Horological Journal' giving notice of the forthcoming annual trial of chronometers.

Correspondence with the Hydrographer of the Navy concerning a proposed increase in the number of chronometers accepted for trial and of those purchased by the Navy, 1891-1892. The correspondents are J. Uhrig, C. Frodsham, E. Dent, W. Humphreys, W. Cardall, F.J. Clerke, A. Johannsen and J. Pyott.

Correspondence with the Admiralty concerning the late delivery of the results of the deck watch trials, the purchase of deck watches, and regulations concerning the requirement of advance notice of prices before trial, 1891-1892.

Correspondence concerning the annual trial of chronometers, including a list of results in order of merit, a rough abstract and a table of rates after the application of approximate acceleration, 1891-1892.

Correspondence concerning the annual trial of deck watches, including a list of watches entered for trial and tables of rates, 1891-1892.

Two printed sheets giving the regulations of the trial of deck watches and a rough sheet giving corrections for a reprint [1891-1892].

Correspondence with the watch-manufacturers W. Holland, S. Smith and Son, E. Dent and Co., W. Humphreys, Usher and Co., Francis M. Moore, Leroy and Cie, G.W. Carley, W.G. Schoof, James Imray and Son, and M. Spiegelhalter and Son concerning the trial of deck watches, 1891-1892.

Internal memoranda and notes concerning the annual trial of deck watches and chronometers, 1891-1892.

Correspondence with the Hydrographer of the Navy concerning his suggestion that lever watches should have five beats to two seconds, 1892.

Correspondence with the Admiralty concerning the results of the chronometer trial, 1892-1893, including a rough abstract on the trial.

Correspondence and notes concerning the annual trial of deck watches, 1892-1893, including an abstract on the annual trial of deck watches, classes A and B, 1892-1893.

Correspondence concerning the second trial of deck watches, 1893, including correspondence with the watch-manufacturers Leonard Hall, S. Smith and Son, A. Webb and David Keys.

Correspondence with the watch-manufacturers A. Webb and V. Kullberg concerning the annual trial of chronometers, 1892-1893.

Correspondence with F.J. Britten concerning the publication of the results of the annual trial of chronometers, 1892-1893, including correspondence with the watch-manufacturers R. Gardner, V. Kullberg, H.P. Isaac, Kendal and Dent, T. Mercer, J. Penlington, J. Pyott, W.G. Schoof, A.W. Webb and C.A. Williams, and a list of chronometers entered for trial, with the results in order of merit.

'Tests of divisions on the seconds dials of the annual trials of deck watches', 1892-1893.

Miscellaneous correspondence with chronometer-manufacturers concerning the annual trial of chronometers, 1892-1893. The correspondents include S. Smith and Son; W. Humphreys; Samson M. Ayers; Henry Gardner; H.P. Isaac; M. Walker; R. Plaskett; J. Clerke; M.F. Dent; and Brockbank, Atkins and Moore.

Correspondence concerning the annual trial of chronometers and deck watches, 1893-1894, including correspondence with the Hydrographer of the Navy concerning the effect of the public trials at Kew Observatory on those at the Royal Observatory, the results of the chronometer trials and a list of results in order of merit.

Correspondence concerning the annual trial of deck watches 1893-1894, including an abstract of the results and a list of chronometers purchased by the Admiralty.

'Range of Dials of the Annual Trial of deck watches 1893-1894.'

Correspondence with the chronometer-maker Robert Gardner concerning his complaint about the low prices offered by the Admiralty for chronometers, 1893.

Correspondence with chronometer-makers concerning the annual trial of deck watches and chronometers, 1893-1894. The correspondents include R. Gardner, J. Player and J. Hammersley.

Correspondence with F.J. Britten, editor of 'Watchmaker and Jeweller', 1893-1894, concerning the publication of a notice to announce the annual chronometer trial.

Miscellaneous correspondence with chronometer-manufacturers, 1893. The correspondents include J. Hammersley, Le Roy and Fils, J. White and Son, Parkinson and Frodsham, and Daniel Buckney.