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Pierre Le Roy
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Pierre Le Roy was a French clockmaker. He was the inventor of the detent escapement, the temperature-compensated balance and the isochronous balance spring. His developments are considered as the foun
Pierre Le Roy
Description of the Le Roy detent escapement mechanism by the Académie des Sciences, 14 August 1748.
Description of the Le Roy detent escapement mechanism by the Académie des Sciences, 14 August 1748.
Le Roy detent escapement mechanism.
Le Roy detent escapement mechanism.
Pierre Le Roy chronometer, 1766, Musée des Arts et Métiers
Pierre Le Roy chronometer, 1766, Musée des Arts et Métiers
Henry Sully
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Henry Sully was an English clockmaker. He was an apprentice and then journeyman for celebrated English clockmaker and watchmaker Charles Gretton. He lived in France for many years.
Henry Sully (1680-1729).
Henry Sully (1680-1729).
Henry Sully's clock (Fig.1) with escapement (Fig.2) and shipboard gimbaled suspension mechanism (Fig.7).
Henry Sully's clock (Fig.1) with escapement (Fig.2) and shipboard gimbaled suspension mechanism (Fig.7).
Henry Sully built the Gnomon of Saint-Sulpice.
Henry Sully built the Gnomon of Saint-Sulpice.
Regle artificielle du temps, 1737
Regle artificielle du temps, 1737