Definition of hairspring in English:

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hairspring

Pronunciation: /ˈhɛːsprɪŋ/

noun

A slender flat coiled spring regulating the movement of the balance wheel in a watch.
Example sentences
  • This oscillation is not exactly a parallel to the balance wheel and hairspring of a clockwork watch, but the fact is that both use oscillations to keep track of passing time.
  • The curb pins on the regulator must be adjusted so that the hairspring hits them when it is supposed to.
  • In most cases they used a long extension of the hairspring and pinned it to the base of the balance cock.
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