Balance spring

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Balance spring

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A balance spring, or hairspring, 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)

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chronometer helix

showing curving ends

early balance springs