: COMMON THINGS CLOCKS AND WATCHES. 



which corresponds to the escapement-wheel by the intermediate 

 wheels and pinions, /, r, g, G, h, H, and t. The wheel r drives 



Fig. 31. 



the pinion k, upon the axle of which is fixed the regulator K. 

 This regulator is a fly, a side view of which, upon a larger 

 scale, is shown in fig. 32. 



The pinion, which is made to revolve by the wheel w, gives 

 a motion of rotation to the fly A A' B'B, which consists of a thin 

 rectangular plate of metal, along the centre of which the pro- 

 longation M L of the axle of the pinion is attached. The flat 

 surfaces of the fly, revolving more or less rapidly, strike against 

 46 



