Breguet overcoil (Breguet spring)

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Rolex parachrom hairspring / Timed breguet hairspring

Balance spring with terminal curve whose final curve is formed around the actual balance spring according to precise calculations. With this invention, Abraham-Louis Breguet was able ti considerably reduce the effects of the dynamic balance error of a flat Archimedean balance spring.

40.142 (0735)
de Breguetspiralfeder reguliert nl
en Timed breguet hairspring pt Espiral breguet regulado
es Espiral breguet regulado ru Спираль брегетированная, правленная
fr Spiral breguet réglé
it Spirale breguet regolata
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Literature