Glossary of watchmaking - Fondation de la Haute Horlogerie

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Casing ring

Cercle d'emboîtage | ケーシングリング | 表壳垫圈

A ring fitted around the movement to fill the gap between the movement and the case.

Catch

Ergot | キャッチ | 扣锁

A projection of a part, wheel or lever which generally hooks or throws into or out of motion.

Century leap year

Année séculaire bissextile | 世紀閏年／セイキウルウドシ | 世纪闰年

Introduced with the reform of the Gregorian calendar in 1582 to take into account the time taken...

Ceramic

Céramique | セラミック | 陶瓷

From the Greek keramos meaning fired pottery. In watchmaking, ceramic is a high-tech material,...

Chablon

Chablon | シャブロン | 模板机芯

A watch movement without the dial or hands in which some or all of the parts have yet to be...

Chamfer (Bevel)

Angler ou chanfreiner | 面取り／メントリ | 倒角（去角）

To form a flat surface by hand-filing the sharp edge of a bridge, plate, screw head, etc....

Champlevé(e)

Champlevé(e) | シャンルベ | 雕刻内填

Describes a metal surface that has been hollowed using a graver to form cells that will be filled...

Chimes

Sonnerie carillon ou cathédrale | チャイム | 和弦

The quarter-hours are sounded on three, four or more gongs with different pitches, the best-known...

Chip

Puce | チップ | 芯片

Name familiarly given to an integrated circuit.

Chronocomparator

Chronocomparateur | クロノコンパレーター | 时间比较仪

A device for rapidly verifying a watch's rate.

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