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Glossary of watchmaking

Isochronism

Isochronisme | 等時性/トウジセイ | 等时性

The property of being isochronal.

The science of timing lies in achieving isochronism of the regulating organ of a timekeeping instrument. The principal factors that can impair a balance's isochronism are the escapement, incorrect poising of the balance and spring, play between the curb pins and the balance spring, centrifugal force and magnetic fields.