Scope and Contents Correspondence concerning clocks, time and the 24-hour time system, including the following material:(1) Non-Observatory clocksMemorandum on the history of 'Joseph Knibb', 17th-century London clockmakers, 1925.Correspondence between Ethel M. Knocker, British Columbia, and Sir Frank Dyson regarding the history of Joseph Knibb, 1925.(2) Non-Observatory chronographs and transitsCorrespondence between Sir Harold Spencer Jones and the Mercantile Marine...

Scope and Contents (1) Correspondence regarding clocks and sympathetic clocks, 1879-1893Correspondence on clocks and sympathetic clocks not belonging to the Royal Observatory:Correspondence between H. Eaton, G.S. Criswick, T. Lewis, W.H.M. Christie, Dent and Co., H.H. Turner and J. Buckney regarding the Westminster Clock, 1879-1887. The topics discussed are poor signals from the clock; inaccurate time; errors and the stopping of the clock; renewal of signal wires; changes in the organisation...

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Correspondence regarding clocks and chronographs, including correspondence with the Japanese Consul and E. Dent and Co. on a chronograph for the Japanese Government, 1880; and correspondence relating to various inventions associated with clocks, 1886-1937, including Mr Schoof's gravity escapement (1897), the Synchronome Co. Ltd's synchronised pendulum (1937), Mr Gordon's pneumatic clock system (1886), and R.W. Nichol's pendulum (1913).

Scope and Contents Correspondence concerning time signals, including the following material:Correspondence with E. Dent and Co. regarding irregularities in the Westminster Clock, tables of errors for the clock and newspaper cuttings relating to it, 1902-1906.Correspondence regarding the installation of a wireless-telegraph receiving station at Greenwich, 1912-1914.Correspondence of 1912-1915 regarding the inauguration of a wireless-telegraph time service from the Eiffel Tower and...

Scope and Contents 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,...

Scope and Contents Papers concerning the installation of the 36-inch Yapp Reflector at Greenwich, including the following material:(1) Miscellaneous materialUndated scroll containing the proposed inscription for the new Yapp Telescope.Envelope of photographs of the 36-inch reflector at Edinburgh, showing the telescope observing carriage and grating, 1931.(2) Correspondence with Hutchinson and Cuff, solicitors, and William Johnston Yapp regarding the 36-inch reflector,...