MORTENSON, Otto. Jens Olsen's Clock, a technical Description. Copenhagen: 1957. 296 x 205mm. -- SYMONDS, R.W. Thomas Tompion, his Life and Work. London [etc.]: 1969. 290 x 220mm. -- MERCER, Vaudrey. John Arnold & Son Chronometer Makers 1762-1843. London: 1972. 245 x 185mm. -- The Life and Letters of Edward John Dent Chronometer Maker and some Account of his Successors. London: 1977. 243 x 185mm. -- The Frodshams, the Story of a Family of Chronometer Makers. London: 1981. 240 x 180mm. -- CHAPIRO, Adolphe. Jean-Antoine Lépine horloger (1720-1814). Paris: 1988. 280 x 240mm. -- SABRIER, Jean-Claude. Longitude at sea in the time of Louis Berthoud and Henri Motel. Geneva: 1993. 310 x 240mm. Text in French and English, presentation inscription on title. All with plates and illustrations, some colour. Original bindings, most with dust-jackets. -- And 11 other books and pamphlets on P.F. Barraud, T. Cole, F. Berthoud, T. Mudge, A.L. Breguet, S. Willard etc. (18)