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. 

 !<— Fipes. G— Apertures of pipes. H— Trough. (Fifth kind of pump— see p. i8i) 



