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2019-11-10 07:33:25
Cassini, Jean Dominique [Pierre Le Roy]
Voyage fait par ordre du roi en 1768, pour éprouver les montres marines inventées par M. le Roy, avec le mémoire sur la meilleure manière de mesurer le tems en mer, qui a remporté le prix double au jugement de l'Académie Royale des Sciences. Contenant la description de la montre à longitudes, présentée à sa majesté le 5 août 1766 (1770)
Charles-Antoine Jombert, Paris, 1770. FIRST EDITION OF A VOYAGE BY CASSINI TO TEST THE NEW MARINE CLOCK - CHRONOMETER -- OF PIERRE LE ROY. Le Roy's chronometer superceded one by John Harrison that had been used for many years. Le Roy's invention - as Cassini's report makes clear -- became the most accurate sea chronometer and was described by Rupert T. Gould of the British Royal Navy as the first modern chronometer. Notably, this book bears the bookplate of Commodore F. H. Kjolsen, a Danish naval officer engaged in WW II and who went on to be the Danish naval attache in Washington. The commodore took part in blowing up and sinking the Danish fleet in Copenhagen in 1940 to prevent its falling into enemy hands. At that time he was seized and placed in a German prison camp. Two months later he escaped and sailed to Sweden in a fishing boat with his wife and three children. John Harrison, an English self-educated carpenter and clock maker, invented the first practical marine chronometer, which enabled navigators to compute accurately their longitude at sea. Harrison's invention revolutionized the problem of longitude at sea; still, Harrison spent 31 years of experimenting, testing, and fine-tuning an invention that had already revolutionized navigation and enabled the Age of Discovery and Colonialism to accelerate. In 1766, Pierre Le Roy, watchmaker to King Louis XV, constructed his own chronometer. Though Le Roy had championed Harrison's invention, his own differed from Harrison's in a number of significant ways. Le Roy's chronometer incorporated a detached escapement, somethi … [Click Below for Full Description]
Bookseller: Atticus Rare Books [West Branch, IA, U.S.A.]
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