Inertia block
慣性ブロック／カンセイブロック
惯性块
Inertia block
Masses ou masselottes
Glossary
Thematic
Regulation, Technic
Small pieces of metal placed on the balance of the watches to regulate variation in rate in the absence of an index, in particular for chronometers.
A small piece of metal whose inertia slows or accelerates the movement of the balance.