Correspondence and papers regarding the Time Service and time signals, including alterations to signals, equipment, maintenance, faults, accommodation at Abinger, and the transition to Herstmonceux. The correspondents include H.M. Smith, the Admiralty, Mr Barker, R. Atkinson, H. Spencer Jones and R. Woolley. The papers include the following items:

Correspondence between H.M. Smith and the Admiralty regarding 'Timing by Lovan-C' transmissions, 1963.

Correspondence with A.P. Herbert regarding a standard time for countries in the European Economic Community, 1962.

Letter to Professor Zagar concerning publications by the Time Department, 1958.

Correspondence concerning the sale of 'electronic scrap' at Abinger and second-hand equipment at Feldmore, 1957.

Correspondence concerning erratics in International Time Signals, 7-21 September 1954, including graphs.

Report by Dr H.S. Halfield and O.G. Edholm concerning an 'Integrating device for very small electric currents', 1952.

Correspondence with the National Bureau of Standards, Washington, regarding a new system of radio propagation disturbance warnings, 1952.

Correspondence with the Hydrographer and Director of Signals Division concerning minimising interference with the reception of American Time Signals, including lists of signals received at the Royal Greenwich Observatory, 1952.

Department of Defence release concerning the new United States Naval Radio Telescope, 1951.

Correspondence with Dr R.S.J. Spilsbury, National Physical Laboratory, concerning values of the frequency of M.S.F. transmission, 1950, including a chart.

Correspondence between M.A. Janjon and H.M. Smith concerning the speed of propagation of radio waves, 1950.

Correspondence with H.M. Smith and D.H. Sadler concerning the Bamberg observations, 1950.

Correspondence with the Telephone Manufacturing Company concerning 'speaking clocks', 1950.

Correspondence concerning an American report titled 'Test of Radio Time Comparator', 1950.

Correspondence with H.M. Smith regarding standard frequency transmissions, quartz clocks and the Annual Term, 1950.

Correspondence with H.F. Finch concerning the rate of rotation of the Earth, 1950.

Correspondence with R. Atkinson regarding photographs of the observatory, 1949.

Correspondence concerning time signals prior to 1849 and time balls, 1949.

Report on the work of the Magnetic Department at Abinger, and also on Time Service work, 1949.

Time Service circulars, 1948.

Correspondence with the Director General of the Turkish Geodetic Survey concerning time signals, 1948.

Correspondence with Professor Rocard, Professor Danjon and the Director of the Laboratoire National de Radioelectricite concerning H.M. Smith's visit to the Bureau de l'Heure, Paris, 1947.

Correspondence between H.M. Smith and H. Spencer Jones regarding chronographs, 1947.

Correspondence with Messrs James Cooke and Sons Ltd concerning repairs to the Gate Clock at the Royal Observatory, Greenwich, 1946.

Correspondence with the National Physical Laboratory regarding the construction of the Sears-Tomlinson chronographs, 1946.

Correspondence with the Admiralty concerning the 'Circular Time Base Frequency Meter', 1946.

Correspondence with Cinema-Television Ltd and a report on 'The Cintel Decimal Counter chronometer', 1946.

Correspondence with the Admiralty concerning the accuracy desired in rhythmic time signals, 1943.