Crown-Wheel
A wheel whose teeth are set at right angles to its plane. A contrate wheel. The escape wheel of the verge escapement is a crown wheel.
How to true a balance, repair a chipped dial, temper a spring or test a stone — the working bench-book of the American watch trade, arranged A to Z.
A wheel whose teeth are set at right angles to its plane. A contrate wheel. The escape wheel of the verge escapement is a crown wheel.