Correspondence with T. Lewis and E. Dent and Co. concerning repairs to clocks and correspondence with W.H. Shepherd, 1888-1889.

Correspondence with Victor Kullberg concerning the tender for the supply of new electric dials and the repair of old ones, 1897-1899.

Correspondence with clockmakers, principally V. Kullberg and Dent and Co., concerning repairs to Royal Observatory clocks and chronometers, 1901-1911.

Internal memoranda on the subject of clocks, chronographs and chronometers, 1892-1909, including a list of clocks at the Royal Observatory and on loan on 22 June 1892.

List of Royal Observatory chronometers on 25 June 1894.

Correspondence with Troughton and Simms concerning chronographs, including an estimate for a new chronograph for the New Altazimuth Instrument, 1897.

Correspondence with T. Cooke and Sons and an estimate for a new chronograph for the New Altazimuth Instrument, 1898

Correspondence with Sir Howard Grubb and an estimate for a chronograph for the New Altazimuth Instrument, and correspondence with the Admiralty and approval of this estimate, 1897-1898.

Internal and external memoranda concerning chronographs, 1889-1906.