A history of the growth of the steam-engine (1878)
Thurston, Robert Henry, 1839-1903 · New York, D. Appleton · leaf 391
are objectionable on account of their greatfriction, are avoided. Corrugated pistons, or irregularcams, CD, are adopted, forming chambers within the cases.In the engine the steam enters at A, at the bottom of thecase, and presses the cams apart. The only packing usedis in the ends of the long metal… … Jig. 124.—Rotary Pnmp. the engine. This is the reason given in support of theclaim that the rotary engine forces water to a given dis-tance with from one-fourth to one-third the steam-pressurenecessary to drive all reciprocating engines. The smalleramount of power necessary to do the work, the less…
Steam-engines
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