crown wheel

Century Dictionary and Cyclopedia

1. n. A wheel having cogs or teeth set at right angles with its plane, as, in certain watches, the wheel that is next the crown and drives the balance. It is also called a contrate wheel or face-wheel.

Wiktionary

1. n. In watchmaking, an object of circular shape with contrate teeth, which meshes with the winding pinion and with the ratchet-wheel on the barrel-arbor used to wind-up the watch, respectively, to set the time.

GNU Webster's 1913

1. n. See in the Vocabulary.
2. (Mach.) A wheel with cogs or teeth set at right angles to its plane; -- called also a contrate wheel or face wheel.