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| BERTHOUD, Ferdinand
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| Essaie sur l'Horlogerie
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Paris: Jombert 1763
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| First edition.
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| Two vols large 4to. 38 folding plates.
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| Contemporary mottled calf, gilt spines, morocco lettering pieces.
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An important and scarce treatise on precision watch and clock-making, including an extensive treatment of Berthoud's early efforts at building a marine chronometer to compete with John Harrison's longitude chronometers. One of his marine clocks was tested at sea by the Marquis de Courtanvaux in the voyage of the frigate Aurora. Courtanvaux himself was the grandson of the Marquis de Courtanvaux to whom Jean Richer presented a copy of his Observations astronomiques et physiques faites en l'Isle de Caienne which itself figures prominently in the history of longitude navigation.
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