Correspondence on time balls and signals, 1870 - 1875
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.
- 1870 - 1875
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1 archive box(es) (1 box)
Language of Materials
Former / Other Reference
Finding aid date
- Christie, William Henry Mahoney, Sir, 1845 - 1922 (Knight, astronomer)
- Evans, Frederick John Owen, 1815 - 1885 (hydrographer)
- Langley, Samuel Pierpont, 1834 - 1906 (astronomer, physicist and aeronautics pioneer)
- Post Office
- Siemens, Charles William, Sir, 1823 - 1883 (Knight, metallurgist and electrical engineer)
- Walker, Charles Vincent, 1812 - 1882 (electrical engineer)