Balance spring

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

Breguet overcoil (Breguet spring)

other languages: de

Literature

• The Marine Chronometer. Its History and Development, ISBN 0-907462-05-7
• Time and Timekeepers, ISBN 0780800087