Correspondence with the Admiralty concerning the proposal and estimated cost of electrical light installations at the Royal Observatory, 1891-1894, including tenders from various companies.

Contract with Johnson and Phillips to install electric lighting at the Royal Observatory, with related correspondence, 1892-1896.

Tenders from J.D.F. Andrews and Co., the Anglo-American Brush Co., Drake and Goreham, and Siemen Bros., all of which were rejected, with related correspondence, 1892.

Miscellaneous papers and memoranda to staff on the installation of electric lighting at the Royal Observatory, 1891, with a black and white photograph of the gas engine and dynamo installed at the Observatory and an envelope containing a small reel of copper lamp fuse wire.

Correspondence with Messrs Verity and Co. and the General Electrical Company concerning the lighting for the Physical Observatory and the New Altazimuth, 1897-1901.

Correspondence with Niblett and Sutherland concerning the lighting for the east and west wings of the Physical Observatory, 1899-1901.

Correspondence with the Alliance Electrical Co. concerning the lighting for the basement and libraries, 1900-1901.

Correspondence with the Admiralty concerning the renewal of the electric light accumulator at the Royal Observatory, 1899.

Correspondence with Johnson and Phillips concerning the renewal of the electric light accumulator at the Royal Observatory, 1898-1899.

Correspondence with the Electric Power Storage Co. Ltd concerning the renewal of the electric light accumulator at the Royal Observatory, 1899.

Correspondence and a contract with the Chloride Electric Storage Syndicate Ltd for a new accumulator, 1899-1900.

Further correspondence with the Chloride Electric Storage Syndicate Ltd, 1900.

Blueprints: 'Arrangement of 53 RG4 Cells' and 'Arrangement of CE55 RG Cells', 1899.

Correspondence with the Chloride Electric Storage Co. Ltd, the Admiralty, the D.P. Battery Co., Johnson and Phillips, and the Tudor Accumulator Co. concerning the disposal of the old accumulator and the purchase of a new one, 1902.

Correspondence with the Admiralty concerning the renewal of the accumulator, 1904.

Correspondence with the D.P. Battery Co. concerning the renewal of the accumulator, with blueprints of cells, 1904.

Correspondence with the D.P. Battery Co. concerning the periodical inspection of the battery, 1904.

Consignment notes and delivery arrangements for the new accumulator battery, 1904.

Correspondence with Johnson and Phillips, the Tudor Accumulator Co. and the Chloride Electric Co. concerning the removal of the accumulator, 1904.

Correspondence with the Admiralty concerning the disposal of the old accumulator battery, 1905.

Various memoranda concerning the renewal of the accumulator, 1904.