l82 



BOOK VI. 



A TAPPETS OF PISTON-RODS. B CAMS OF THE BARREL. C SQUARE UPPER PARTS 



OF PISTON-RODS. D LOWER ROUNDED PARTS OF PISTON-RODS. E CROSS-BEAMS. 



F PIPES. G APERTURES OF PIPES. H TROUGH. (Fifth kind of pump see p. 181). 



