Glossary of watchmaking - Fondation de la Haute Horlogerie

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Bolt

Targette | ボルト | 按掣栓

A catch that can be operated from the outside of a watch case to trigger a mechanism, for example...

Bort

Bort | ボルツ | 钻石粒

Industrial diamond that is used for polishing.

Bottom plate

Platine | 地板／ジイタ | 底板

The plate which bears the various movement parts and in particular the bridges. The dial is usually...

Bow

Bélière | ボウ | 弓形环

Variously-shaped ring for suspending a pocket watch and fastening a chain.

Bow lathe

Archet | ボウレース | 弓床

The bow is a band of steel strung with a cord, generally gut, which drives the watchmaker's lathe.

Brace (Bridle)

Bride | 保持具／ホジグ | 支撑限位件

Part that holds or retains. Clamp, Winding-stem brace, Mainspring bridle, Slip spring,...

Brass

Laiton | 真鍮／シンチュウ | 黄铜

An alloy of copper and between 30% and 40% zinc. Can be used to make the plates, bridges and...

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.

Bridge

Pont | 受け／ウケ | 夹板

A metal plate under which the pivots of the wheels and pinions turn. Both ends of the bridge are...

Brilliant cut

Taille brillant | ブリリアントカット | 明亮式切工

A round diamond that is cut with 57 or 58 facets or 32 facets + plus the largest facet called the...

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