Fondation de la Haute Horlogerie

Glossary

Balance

A circular, moving part which oscillates on its rotational axis. It is coupled to the balance-spring which gives it the to-and-fro motion through which it divides time into strictly equal parts. Each to-and-fro movement ("tick-tock") is called an oscillation, and each oscillation comprises two vibrations.
A circular mass (rim) held by spokes. Combined with the spiral it forms the regulating organ of the watch.