They tested the clocks on a voyage between Rochefort and Santo Domingo, proving their efficiency and precision. Upon completion, Ferdinand entrusted the two clocks to the Count of Fleurier, explorer, hydrographer, and the King’s ship-of-the-line ensign, escorted by naval astronomer and geographer Canon Pingré. Later that year, King Louis XV agreed to finance the undertaking. In 1766, he sent a letter to France’s Navy Minister, Choiseul, Duke of Pralin, spelling out his plans for Marine Clocks No6 and No8. In 1765 he produced two marine clocks known as No2 and No3. Ferdinand Berthoud devoted his life to seeking the ultimate precision on which marine expeditions depended.
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