Correspondence on the workings of, repairs to, ratings of, and transactions involving chronometers. The volume includes papers on the Westminster Clock and Bell; addresses of chronometer makers; printed papers about Jurgensen and Sons, chronometer makers; new balance springs, 1859-1864; trials and ratings of chronometers for the Indian Store Department; a report on chronometers used aboard HMS 'Hecate'; and a letter by J. Rodwell Hux on the history of horology. The correspondents include C.A.F. Peters, J. Washington, C.F.A. Shadwell, A. de Morgan, G.H. Richards and J.W. Lubbock.