“My watch has stopped - Why?” -  Page 2

Oily or broken Hairsprings, No. 9 and No. 10, make it impossible for a watch to keep time. A perfect hairspring vibrates at the rate of 300 beats per minute.

A common cause of a watch stopping is a Roller Table from which the Roller Jewel has broken away – No. 11.  This Jewel is the base of a lever which goes back and forth 18,000 times per hour.

The Balance Wheel, No.12, controls the Hairspring.  It must be absolutely perfect or the watch will not keep good time.  Its screws must be delicately adjusted, the wheel itself must be level.

Escape Jewels and Teeth on Pallet, No. 13 and No. 14, must be perfect to keep a watch running on time. Pallet Jewels may chip or crack and cause trouble.  The Pallet Arbor, No. 14A, may become bent or broken, stopping the movement of the watch.