Correspondence and papers concerning galvanism and electric clocks. The correspondents include C.F. Varley, C.V. Walker and W. Fronde. The papers include a printed list of the charges for receiving the time signals on private lines; a diagram of the galvanic wires running from Greenwich Railway Station; pages from 'Nature' on the Greenwich Time Signal system; an extract, originally from the 'Mining and Scientific Press', titled 'New Break-Circuit Chronometer', concerning a chronometer invented by Davidson; a printed 'Description of the Chronopher...of the Electric and International Telegraph Company in London'; a page extracted from the 'Telegraphic Journal' on the manner of firing the time gun at Pernambuco; an article, originally from the 'The York Daily Herald', on an improved telephone patented by E. Cox Walker; and an extract from 'The Glasgow Herald', 18 May 1876, titled 'Transmission of correct time from the Observatory to the City and Port of Glasgow'.