Henry Sully

Henry Sully (1680–1729) 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.

Marine clock Henry Sully's clock (Fig.1) with escapement (Fig.2) and shipboard gimbaled suspension mechanism (Fig.7). He invented a marine clock to determine longitude accurately, a sophisticated pendulum clock. He was the first person to develop a chronometer in Paris. In 1718, Henry Sully established a watch factory in Versailles.

Henry Sully worked with Julien Le Roy, a clockmaker to Louis XV. In France, Henry Sully was followed in his developments by Pierre Le Roy and Ferdinand Berthoud.

In 1737, another one of his books was published: Illustrations de Règle artificielle du temps, traité de la division naturelle et artificielle du temps....

Works