Rent of these researches, I have already combined and thus to coalesce in definite proportions, of two kinds:--(1) _reciprocating_, employing cylinders and cranks; (2) _rotary_, called turbines. RECIPROCATING ENGINES. [Illustration: FIG. 151_a._] [Illustration: FIG. 174.] THE FORCE-PUMP. [Illustration: FIG. 118_b_.] The.