Balance spring
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A balance spring, or hairspring, is a spring attached to the balance wheel in mechanical timepieces. It causes the balance wheel to oscillate with a resonant frequency when the timepiece is running, w
Balance wheel in a 1950s alarm clock, showing the (1) balance spring and (2) regulator.
Drawing of one of his first balance springs, attached to a balance wheel, by Christiaan Huygens.
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
Description of the Le Roy detent escapement mechanism by the Académie des Sciences, 14 August 1748.
Le Roy detent escapement mechanism.
Pierre Le Roy chronometer, 1766, Musée des Arts et Métiers