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CHAPTER 1. 
Plate I. — the watch. 
Fig. 1. The box , or barrel , containing the main spring, which is 
the first power; and the chain , which communicates the power 
to— 
Fig. 2. The fusee and great wheel. The fusee is tapered at the 
top to correct the irregular recoil of the spring. The great wheel 
turns— 
Fig. 3. The centre wheel and pinion, which makes one revolution 
in an hour, carries the minute hand, and turns— 
Fig. 4. The third wheel and pinion, which turns the contrite 
wheel. 
Fig. 5. The contrite wheel, which makes one revolution in a 
minute, and turns the balance or escape wheel. 
Fig. 6. The balance wheel, which acts upon the pallats of the 
verge, and escapes or drops from one pallat to another alternately, 
thereby keeping the balance in constant vibration. 
Fig. 7. The balance verge and balance or pendulum spring, which 
regulates the whole machine. 
Fig. 8. The cannon pinion , affixed to the centre wheel arbour, 
on which the minute hand is placed. 
Fig. 9. The minute wheel. 
Fig. 10. The hour wheel. The two last mentioned wheels are 
turned by the cannon pinion, and having a greater number of teeth, 
move much slower than the cannon pinion, and mark the hour by 
the hand on the dial. 
The above is a description of the several wheels alluded to by 
Paley. Their relative situation, and combined movement, may 
be seen by the simple inspection of a watch. 
