l85 



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. i8i). 



