Glossary of watchmaking - Fondation de la Haute Horlogerie

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Accutron

Accutron | アキュトロン | 阿克特隆电子表

The first electronic watch, controlled by a tuning fork and launched by Bulova in 1960.

Age of the moon

Age de la Lune | 月齢／ゲツレイ | 月相盈亏

The time between successive new moons, shown on a watch dial from 1 to 29½ days, corresponding to...

Assortiment

Assortiment | アソルティマン | 配套件

French term for the three parts of the escapement (escape-wheel, lever and roller). Generally,...

Atomic (clock)

Atomique (horloge) | 原子／ゲンシ | 原子（钟）

A caesium clock draws on the hypothesis of stable atomic properties, in particular the frequency of...

Atomic clock

Horloge atomique | 原子時計／ゲンシドケイ | 原子钟

A caesium clock draws on the hypothesis of stable atomic properties, in particular the frequency of...

Balance

Balancier | テンプ | 摆轮

A circular, moving part which oscillates on its rotational axis. It is coupled to the...

Balance spring

Spiral | ヒゲゼンマイ | 摆轮游丝

A very fine spring and the "heart" of a mechanical watch. Its ends are affixed to the balance and...

Bent index

Raquette coudée | 傾斜緩急針／ケイシャカンキュウシン | 弯曲微调器

The balance spring stud and curb pins are usually within a 90° angle. In a "bent" index,...

Breguet overcoil

Spiral plat coudé ou Bréguet | 巻上げヒゲゼンマイ／マキアゲヒゲゼンマイ | 宝玑双层游丝

Sometimes referred to as a "Breguet spiral", it controls the rate at which the mainspring unwinds.

Cycloid

Cycloïdes | サイクロイド振り子／サイクロイドフリコ | 摆线

A small spiral spring, invented by isochronism to the pendulum's oscillations.