Balance cock (modern)
テンプ受け（近代）／テンプウケキンダイ
摆轮夹板(现代)
Balance cock (modern)
Coq moderne
Glossary
Thematic
Regulation, Technic
A bridge with a lug anchored to a stud. An index (or regulator) passes over a scale indicating Fast Slow in English, Avance Retard in French.