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Henry Sully
Henry Sully (1680–1729) was an English clockmaker. He lived for many years in France.〔(Federation of the Swiss Watch Industry )〕 ==Marine clock==
He invented a marine clock to determine longitude accurately, a sophisticated pendulum clock.〔 He presented a first ''Montre de la Mer'' in 1716 to the French Académie des Sciences.〔(A Chronology of Clocks )〕 He was the first to develop chronometer in Paris.〔(''Encyclopaedia Britannica'' p.276 )〕 In 1718, Henry Sully established a watch factory in Versailles.〔 He presented two new models in 1723.〔 In 1726, he published ''Une Horloge inventée et executée par M. Sulli''.〔 His chronometers performed well in calm weather, but not on the high seas.〔(''Encyclopedia of time'' Samuel L. Macey p.347 )〕 Henry Sully worked with Julien Le Roy, a clockmaker to Louis XV.〔(''Encyclopedia of time'' Samuel L. Macey p.348 )〕 In France, Henry Sully was followed in his developments by Pierre Le Roy and Ferdinand Berthoud.〔 Soon after the 1726 publication of ''Une Horloge inventée et executée par M. Sulli'', John Harrison started developing his own famous chronometer, creating a description and drawings for a proposed marine clock in 1730 and actually manufacturing the Harrison H1 in 1735.〔
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