Correspondence and related papers on the time signal and time ball service, including a proposed time ball on Tuskar Rock in the Irish Sea, with a chart; a proposed time signal at Dundee; cable laying on the Great Eastern Railway; a proposed Ipswich Time Ball; the rating and errors of the Westminster and Post Office clocks; a proposed public clock for the City of London; electric clocks for the Adelaide Parliament, Madras (including a drawing) and Colaba Observatory in Bombay (including three photographs, specifications and trials); plans of electric clock systems; the Lombard Street Clocks; and a paper titled 'Time signals at the Start Point', concerning a naval time service. The correspondents include C.F. Varley, W.S. Jacob, C.V. Walker, M.F. Maury, W. De La Rue, J. Washington, E. Sabine, G.H. Richards, G.W. Hunt, T.H. Farrer, W.G. Romaine, T.M. Gibson and P.H. Colomb.