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

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