Cannon Pinion
The pinion to which the minute hand is attached; so called on account of the pipe attachment resembling a cannon.
To Tighten a Cannon Pinion. The cannon pinion is sometimes too loose upon the center arbor. Grasp the arbor lightly with a pair of cutting nippers, and by a single turn of the nippers around the arbor, cut or raise a small thread thereon.
CAP. The part of the case that covers the movement. A thin metal cover used in some English, Swiss and German watches to cover the movement and attached by studs and a sliding bar or spring.