Wrist Watch

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Sabian Cymbal Logo Wrist Watch with Case 70 OFF $9.99 Time Remaining: 4d 15h 4m Buy It Now for only: $9.99

What does 21 jewels mean in an automatic wrist watch?

Before quartz and atomic wrist watches, there were automatics. What is the function of jewels in these watches????

Reducing friction is an extremely important goal in watchmaking. Jewels have two important properties that help reduce friction. First, they can be made to be very smooth, and therefore they let the metal parts slide easily. Secondly, they are very hard and therefore don't wear down very quickly. The gears in a watch are carefully designed so that the teeth roll on each other, rather than sliding. If the axle of a gear wears away the hole that it sit in, the gear will shift. That means the teeth will no longer roll on each other and therefore friction will be increased.

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This entry was posted on Friday, May 14th, 2010 at 2:03 am and is filed under Instruments. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.