Balance spring

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Balance spring
(or hairspring)

other languages: de                  

A balance spring is a fine spiral or helical spring used in mechanical watches, marine chronometers, and other timekeeping mechanisms to control the rate of vibration of the balance wheel. A balance spring usually has a regulator lever to adjust the rate of the timepiece.


Types of balance springs

flat spiral

Breguet overcoil (Breguet spring)

other languages: de                  

chronometer helix

showing curving ends

early balance springs

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