Pierre Le Roy
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Pierre Le Roy (1717- 1785) was a French clockmaker.
[edit] Biography
Le Roy was born in Paris, eldest son of Julien Le Roy, clockmaker to Louis XV, in which place Pierre Le Roy succeeded his father.
He has a claim to be considered the inventor of the detent escapement, but was distinguished principally in his mastery and improvement of the chronometer and chronograph, above all of the marine chronometer, in which he carried forward the pioneering work of John Harrison. In 1769 he was awarded the double prize offered by the Académie française for the best method of measuring time at sea. He succeeded in giving his instruments the greatest possible regularity by the discovery of the isochronous spiral spring, in which he was in competition with Ferdinand Berthoud, but which he published first.
He was the author of several valuable publications on the art and science of clock-making and chronography, among them the Étrennes chronométriques of 1760.
He died in Vitry in 1785.
[edit] Sources / External links
[edit] References
- Dorange, Auguste Jean, 1880: Notice sur Julien Le Roy, horloger (p.3). Tours: Rouillé-Ladevèze
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