GOULD, Rupert T. The Marine Chronometer. London: J.D. Potter, 1923. 8vo, plates. Original cloth. -- MERCER, Vaudrey. John Arnold & Son Chronometer Makers 1762-1843. London: 1972. 4to, plates. Original cloth, dust-jacket; Edward John Dent and his Successors. London 1977. 2 volumes (including Supplement), 4to, plates. Original cloth and wrappers; The Frodshams; the Story of a Family of Chronometer Makers. London: 1981. 4to, plates. Original cloth, dust-jacket. -- MERCER, Tony. Mercer Chronometers. Ashford: Brant Wright, 1978. 4to, plates and illustrations. Original cloth, dust-jcket. -- TARDY. Dictionnarie des Horlogers français. Paris: 1971. 2 parts in one volume, 8vo, illustrations. Later calf-backed boards. -- JAGGER, Cedric. Paul Philip Barraud. London: 1968. 2 volumes (including Supplement, 4to, illustrations. Cloth and wrappers. -- And 9 others, similar. (18)