Pierre Le Roy
French clockmaker · France · On the map · Scientists · Lived 1717 to 1785 · aged 68
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 foundation of the modern precision clock.
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Le Roy was born in Paris, eldest son of Julien Le Roy, a clockmaker to Louis XV who had worked with Henry Sully, in which place Pierre Le Roy succeeded his father. He had three brothers: Jean-Baptiste Le Roy (1720-1800), a physicist; Julien-David Le Roy (1724-1803), an architect; and Charles Le Roy (1726-1779), a physician and encyclopédiste.
