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Evans, Frederick John Owen, 1815 - 1885 (hydrographer)


Found in 1 Collection or Record:


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...
Dates: 1870 - 1875
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