BERTHOUD - Ferdinand, Paris.
1729: born in Le Locle (Switzerland)
1745: Went to Paris to Julien LE ROY
1754: Master
1771: Horloger de la marine
1807: died
A most eminent horologist and maker of clocks, watches and chronometers
Did much experimental work on timekeepers,
Devised the spring detent probably independently of EARNSHAW.
1759: Published: 'L'Art de régler les pendules,' .
1763: Published: 'Essai sur l'Horlogerie,'
1773: Published: 'Traité des Horloges Marines,
1773: Published: Éclaircissements sur l'Invention des Horloges Marines? .
1775: Published: 'Les Longitudes par la mesure du Temps,'
1787: Published: 'Histoire de la Mesure du Temps,'
1792: Published: 'Traité des Montres à Longitudes,'
1797: Published: 'Suite du Traité des Montres à Longitudes,'
1802: Published: 'Histoire de la mesure du Temps,'
1807: Published: 'Supplément au Traité des Montres à Longitudes,'
Clockmaker to the King and the Marine.
Membre de l'Institute F.R.S. London.
Made first chronometer 1754, sent for trial 1761.
Mantel clock S.K.M.
2 watches: Guildhall Museum
Year regulator and 2 others and 18 marine chronometers Conservatoire des Arts et Métiers, Paris
Repeating watch: M.P.S. Dresden.
Fine cartel clock: Mobilier National, Paris.
Golden watch: Nat. M. Stockholm