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Currently only Chalmers’ Biographical Dictionary is indexed, terms are not stemmed, and diacritical marks are retained.

an eminent French marine clock-maker, a member of the institute,

, an eminent French marine clock-maker, a member of the institute, of the royal society of London, and of the legion of honour, was born March 19, 1727, at Plancemont in Neufchatel. His father, who was an architect and justiciary, had destined him for the church; but the youth having had an opportunity, when only sixteen years of age, to examine the mechanism of a clock, became so fond of that study as to attend to nothing else. His father then very wisely encouraged an enthusiasm so promising, and after having employed an able workman to instruct his son in the elements of clockmaking, consented that he should go to Paris to perfect his knowledge of the art. He accordingly came to Paris in 1745, and there constructed his first specimens of marine clocks, which soon were universally approved and adopted. Bjerthoud and Peter Leroi were rival makers of these longitudinal clocks, and came very near each other, although by different methods, in the construction of them but Berthoud’s superior experience made the preference be