Correspondence and papers regarding standard frequency transmissions of the Royal Greenwich Observatory, including the following items:

Correspondence with H.M. Smith, 1954, including an extract from a paper by L. Essen on standard frequency time.

Correspondence with H.M. Smith regarding barometric pressure variations on the rate of B5, including a graph; investigations of the sub-soil at Herstmonceux; bore-holes for quartz resonators; and variations in the rate of ring crystals, 1953.

Correspondence with A. Kopff concerning comparisons of the N30 and FK3 catalogues, 1953.

Correspondence with Dr Spilbury of the National Physical Laboratory regarding the rate of frequency standard Q13, 1953.

Correspondence with H.M. Smith concerning the Tokyo time signal transmission and the motions of the Moon, 1951-1952.

Correspondence with the Dr Spilsbury and Dr Bullard of the National Physical Laboratory; Sir E. Appleton of the Admiralty; and the Department of Scientific Research concerning the Standard Frequency Transmission Service, including variations in units of time, adjustments and corrections, financing and users.

Correspondence on a visit to the Royal Observatory, Abinger, by the General Post Office, 1949.

Report of the Committee on the M.S.F., 1946.

Proposal for time and frequency transmissions, 1945.