How do wind up clocks work?

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Tags

1. #mechanism
2. #spring
3. #clocks
4. #sweep
5. #windup
6. #weights
7. #clock
8. #store
9. #springs
10. #spiral
11. #energy
12. #around
13. #wristwatches
14. #hands
15. #crown
16. #other
17. #instead
18. #pendulum