Correspondence and papers on telegraphic communications, including the conditions of use of telegraph wires between the Admiralty and the South Eastern Railway; proposed arrangements of galvanic wires and circuits for working the sympathetic clocks; the circuit and plan of the galvanic wires in the Lombard Street Post Office; various improvements and efficiencies in the telegraph; a report on the working of galvanic apparatus at the Royal Observatory; sketches of the automatic switch for the Deal Time Ball; proposed arrangement to connect with the Devonport Time Ball; C.V. Walker's system of train signalling; 'controlling the movements of ordinary clocks by galvanic current' by J. Hartnup; a plan of Morse's recording telegraph; and a proposed telegraph connection between Adelaide and Melbourne. The correspondents include J.C. Clark, C.F. Varley, C.V. Walker, W.G. Romaine, E. Loomis and R. Sheepshanks.