General correspondence with the Hydrographer of the Navy, 1894-1896, concerning the trial of chronometers, the number of chronometers available for issue to the Navy, the inspection of the book of weekly chronometer rates by the Assistant Hydrographer, and the distribution of 'B' class chronometers.

Correspondence between the Hydrographer of the Navy, the Astronomer Royal and members of the Royal Observatory staff concerning the issue of chronometers, 1896-1897, including lists of chronometers available for issue and discussion of various individual chronometers.

'A list of chronometers out for repair over twelve months', 1898.

Correspondence with the Admiralty concerning the delivery of a defective chronometer to HMS 'Imperiense' and the return of the chronometer to the Royal Observatory, 1898.

Correspondence with the Hydrographer of the Navy concerning the review of chronometer records, the issue and return of chronometers to Her Majesty's Ships, occasional repairs to chronometers, and the inspection of the weekly chronometer rates book by the Hydrographer and Assistant Hydrographer, 1898.

Correspondence with the Admiralty concerning the transfer of the Naval Store Depot from Deptford to the West India Docks, 1899.

Correspondence with the Hydrographer of the Navy concerning the return of the deck watch Ollivant and Botsford without its wooden case, 1899.

Correspondence with the Hydrographer of the Navy concerning the suitability of the chronometer Poole 2312 as a navigational chronometer, with an estimate for its repair, 1899.

Correspondence with the Hydrographer of the Navy concerning queries on individual chronometers and the classification of X chronometers, 1899.

Correspondence between the Hydrographer of the Navy, the Commanding Officers of HMS 'Orlando' and 'Endymion', and the Astronomer Royal, 1899-1900, concerning three deck watches that were sent to Hong Kong, which suffered damage from damp on the journey and had to be returned to England. The correspondence includes reports from the captains of both ships regarding the storage of the chronometers whilst in transit.

Correspondence with the Hydrographer of the Navy and Thomas Lewis of the Chronometer Department at the Royal Observatory, 1899-1900, concerning the issue of chronometers and the ordering of stationery.

Correspondence between Thomas Lewis and A.J. Thorne of the Hydrographic Department, 1900, regarding the purchase of chronometers by the Colonial Office, receipts for repairs to chronometers, the extension of loan periods for chronometers, and the return of chronometers from Her Majesty's Ships.

Five sheets of copy-type paper, either blank or too faded to read, 1900. The only legible writing is the signature of Thomas Lewis.

General correspondence between the Astronomer Royal, the Assistant Hydrographer of the Navy, A.J. Thorne and others concerning chronometers, 1901-1902 , including bills and receipts for repairs, the compilation of the weekly chronometer rates book, the exchange of chronometers, the collection of chronometers by Royal Navy staff, and reports on individual chronometers.

Correspondence with James Poole, 1899, concerning his request to examine the Larcum Kendal chronometer (K1) at the Royal Observatory to help him repair Harrison 4, as the two chronometers are of similar design.