How do self-winding watches work by winding themselves?

Self-winding watches wind themselves by using a little pendulum that swings when you move your arm.

A few hours of natural arm movement will wind a self-winding watch enough that it can go for thirty-six hours without further winding.

how do self winding watches work by winding themselves
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Karen Hill is a freelance writer, editor, and columnist for zippyfacts.com. Born in New York, she loves interesting random facts from all over the world.