Fig 13. 



W 



COMMON THINGS. 



CLOCKS AND WATCHES. 



CHAPTEE II. 



22. Action of pendulum on escapement wheel. 23. Rate of motion of hands 

 produced by tooth and pinion work. 24. Method of making pinions. 

 25. Mutual action of toothed wheels. 26. Wheel and pinion. 

 27. Bevelled and crown wheels. 28. Weight applied as a moving 

 power. 29. Why hands not turned back when clock is wound up. 

 30. Mainspring. 31. Its power variable. 32. The fusee. 33. 



LARDNER'S MUSEUM OF SCIENCE. c 17 



No. 70. 



