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— IXS DRUM WHICH IS MADE OF RUNDLES. 



