Papers of George Airy

Correspondence and related papers on the time signal and time ball service, including the failures of the Greenwich time signal; requests for information on time balls; the establishment of time balls or guns at Queenstown, Sheffield, Bristol and Manchester; a paper by S.P. Langley 'On the Allegheny system of electrical time signals'; experiments with the Post Office chronopher; corrections and errors of the Post Office and Westminster clocks; the system of operation employed by the London University Clock; and a paper by F.J. Ritchie on 'Electro-Sympathetic clocks and time signals'. The correspondents include C.V. Walker, F.J.O. Evans, W.H.M. Christie and W. Siemens.

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