Correspondence and related papers on the time signal and time ball service, including the failures of the Greenwich time signal; notes and a report on the time signals at Portsmouth Dockyard; questions and answers on the Edinburgh time signals; a list of British time signal stations; enquiries from various individuals and the Norwegian and Swedish governments on time signals; time balls proposed for Calcutta and the West Indies; errors and corrections in the Westminster and Post Office clocks; regulation of clocks; and J.R. Lund's apparatus for setting clocks. The correspondents include F.J.O. Evans, C.P. Smyth, R. Grant, W.H.M. Christie and R. Hall.