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Correspondence on time balls and signals, 1870 - 1875

Reference Code: GBR/0180/RGO 6/617

Scope and Contents

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.


  • Creation: 1870 - 1875


Conditions Governing Access

From the Management Group:

Unless restrictions apply, the collection is open for consultation by researchers using the Manuscripts Reading Room at Cambridge University Library. For further details on conditions governing access please contact Information about opening hours and obtaining a Cambridge University Library reader's ticket is available from the Library's website (


1 archive box(es) (1 box)

Language of Materials


Former / Other Reference


Finding aid date

2006-01-06 11:52:16+00:00

Includes index.

Repository Details

Part of the Cambridge University Library Repository

Cambridge University Library
West Road
Cambridge CB3 9DR United Kingdom