Balance spring

Balance spring
(or hairspring)

Spiralabzählgerät

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

TERMINOLOGIE NUMEROTATION

40.140 (0734) de Spiralfeder reguliert nl en Timed hairspring pt Espiral regulado es Espiral regulado ru Спираль правленная fr Spiral réglé it Spirale regolata

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

Literature

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