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

• flat spiral
• Breguet overcoil (Breguet spring)
• chronometer helix
• showing curving ends
• early balance springs

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

Literature

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