Scope and Contents Correspondence with various telegraph companies concerned mainly with the failure of time signals, the refurbishment and repairs of wires, the connections with the Royal Observatory, and the trials of overhead wires. There are papers regarding tests on the Dartford Earth current wires; the damage and restoration of telegraph wires due to snowstorms; Airy's details of telegraphic equipment and methods employed at the Royal Observatory, found in 'Description of the galvanic connexions'; a...

Scope and Contents Correspondence and papers concerning improvements and refinements to chronometers, including escapements by G.W. Linderoth, J. Gray, J.C. Bloxam, and W. Eaton; I. Hermann's escapement, with explanations and plans; C.F. Frodsham's experiments on compensator balances; E. Huntingdon's compensating pendulum; a model face of an astronomical clock; H.B. James on his invention, 'the compensator'; extracts from a report on Danish exhibits at chronometer exhibitions; correction of a clock by magnetic...