Epicycloid
A curve generated by a point in the circumference of a movable circle, as it rolls upon another circle. The teeth of driving wheels are usually of this form.
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 curve generated by a point in the circumference of a movable circle, as it rolls upon another circle. The teeth of driving wheels are usually of this form.