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Glossary of watchmaking

Bearing

Coussinet | 軸受け/ジクウケ | 轴承

Grand complication pocket watch

A hole made directly in the brass plate and in which a steel pivot, part of the greatrain or escapement, turns. The problems of friction this caused were solved when Nicolas Fatio had the idea to use drilled natural rubies as bearings. These natural stones were later replaced by synthetic rubies, made in 1892 by Auguste Verneuil.