Glossary of watchmaking - Fondation de la Haute Horlogerie

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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,...

Beryl

Béryl | ベリル | 绿宝石

A family of stones that share the same crystalline and chemical properties. Varieties include the...

Bezel

Chaton | シャトン | 宝石座

In a watch movement, the metal rim that secures a jewel.

Bezel

Lunette | ベゼル | 表圈

A ring around the case middle that secures the crystal. A rotating bezel records additional...

Bezel or collet setting

Serti clos ou serti rabattu | ベゼル（コレット）・セッティング | 宝石座镶嵌

The stone is encircled by a strip of metal which is pressed over so as to extend slightly over the...

Birefringence

Pierre biréfringente | 複屈折性／フククッセツセイ | 双光折射

The property of all stones, except those of the cubic crystal system (diamond, garnet and spinel),...

Blanc roulant

Blanc roulant | ブランク・ルーラン | 空壳机芯

A working movement without its escapement and ready for assembly, rating, adjusting and finishing.

Blank

Blanc | ブランク | 空壳机芯

An unfinished movement sold as such. Until circa 1850, an ébauche comprised only the plate,...

Block

Plot | ブロック | 垫块

In a lever escapement, the dart is fixed to a block at the base of the fork.

Blued steel

Acier Bleui | ブルースチール | 蓝钢

Steel that has been heated until its surface oxidises to become a more or less dark blue.

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