Correspondence and papers regarding quartz clocks, including the following items:

Correspondence with M.L. Bateman and A. Hunter regarding the new the 'Isatome' portable quartz clock, 1963.

Letter from H.M. Smith to the Division of Scientific Intelligence, Ministry of Defence, regarding Russian work on quartz clocks, 1957.

Correspondence with H.M. Smith concerning the Time Department's move to Herstmonceux and the performance of ring crystals, including graphs, 1955.

Correspondence with the National Physical Laboratory and Post Office, Dollis Hill, regarding ring crystals and a caesium resonator, 1955.

Correspondence with the Admiralty concerning quartz crystals for Herstmonceux, 1955.

Correspondence concerning various Shortt clocks, 1954.

Letter from T. Gold to Dr Kurti regarding cooled quartz clocks, 1954.

Correspondence between the Astronomer Royal, H.M. Smith, the Admiralty and the Post Office concerning ring crystals and valves for quartz clocks at the Royal Observatory, 1950-1954.

Correspondence between the Astronomer Royal, H.M. Smith, the Admiralty and the Post Office regarding quartz crystal oscillators, orders, temperature control and ring crystals, 1950.

Correspondence with J.A. Ratcliffe concerning the loan of a Shortt free pendulum clock and slave clock to Cambridge University, 1950.

Correspondence with H.M. Garner of the Ministry of Supply and H.M. Smith regarding the construction of an atomic clock and checking the frequency of a quartz crystal clock against atomic frequency, 1950.

Correspondence with P. Sollenberger, U.S. Naval Observatory, concerning the rate of rotation of the Earth, 1950.

Letter from H.M. Smith to R. Woolley at Mount Stromlo reviewing changes in work at Greenwich, particularly the Time Department, 1949.

Correspondence with Dr M. Barros concerning quartz clocks and a visit to Abinger by a Portuguese engineer, 1948.

Correspondence between H.M. Smith, C.F. Booth and H. Spencer Jones and a report concerning discussions on the standards of crystals at the Royal Observatory, 1949.

Correspondence between R. Woolley and R. Atkinson concerning the poor standard of crystals supplied to the Royal Greenwich Observatory by the General Post Office, 1949.

Correspondence with various people concerning the installation of quartz clocks at the Royal Greenwich Observatory and visits by foreign scientists, including M.E. Guyot and P. Bourgeois, 1948.

Correspondence and report on various makers of equipment for the Time Department of the Royal Greenwich Observatory, including the General Post Office and Rohde and Schwartz, as well as the precision chronographs of the Etablissements Edouard Belin, 1948.

Correspondence with H.M. Smith and Dr Jackson concerning the loan of Shortt clocks to the Royal Observatory, Cape of Good Hope, 1947-1948.

Correspondence with W.S. McClenahan, Ottawa, concerning the installation of a photographic zenith tube at the Dominion Observatory, 1947.

Correspondence between the Astronomer Royal, H.M. Smith, the Admiralty, Dr Rohde and Sir C. Jones concerning the quartz clock equipment made by Rohde and Schwarz of Munich, details of equipment, price lists, approval of purchase, etc., 1945-1948.

'Notes on Interrogation of Dr L. Rohde at BIOS Reception Centre, Hampstead, on February 26, 1947' by R. Atkinson.

Correspondence with R. Woolley concerning longitude observations, 1946.

Correspondence with Dr Rayner concerning decimal counter chronometers, 1946.

Correspondence with W.H. Shortt, Southern Railway, concerning the construction of quartz clocks by the Synchronome Company, 1946.

Correspondence with the Argentine Naval and Air Attache concerning instruments for the Naval Observatory, Buenos Aires, 1945.

Letter to the Admiralty concerning the value of short wave signals sent out from the Royal Greenwich Observatory, 1945.

Comparisons made at Dollis Hill of the frequency differences of crystals B2, IVA and IVC, 1945.