Correspondence on the rates of, repairs to, trials of, sales of, regulations of, requests on, and ownership of chronometers. The volume covers chronometers for ascertaining a ship's speed; regulations for the testing of chronometers at Liverpool Observatory; mail guards' watches; accounts for chronometers and relevant charges; chronometers for the Indian Department and the Austrian government; the Burdett-Coutts prize for the best essay on balance-springs; and a Swiss report on chronometers and watch-making. The correspondents include C. Wheatstone, G. Richards, F.J.O. Evans, W.H.M. Christie, L.A. Quetelet and W. Harkness.