BOOK VI. 



211 



A MACHINE FIRST DESCRIBED. B THIS WORKMAN, TREADING WITH HIS FEET, is COM- 

 PRESSING THE BELLOWS. C BELLOWS WITHOUT NOZZLES. D HOLE BY WHICH HEAVY 

 VAPOURS OR BLASTS ARE BLOWN OUT. E CONDUITS. F TUNNEL. G SECOND 



MACHINE DESCRIBED. H WOODEN WHEEL. I ITS STEPS. K BARS. L HOLE IN 

 SAME WHEEL. M POLE. N THIRD MACHINE DESCRIBED. O UPRIGHT AXLE. 



P ITS TOOTHED DRUM. Q HORIZONTAL AXLE. R ITS DRUM WHICH IS MADE OF RUNDLES. 



