Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 540
but the piston is elliptical, its transverse diameter being equal to that of the cyl-inder, hence it performed the part of two pistons. There are also two flaps on opposite sides of thecyUnder. In other pumps the flaps, instead of acting as hutments, are made to perform the part of pistons;this is… … In Fig. 3138 the butment is movable. A solid wheel, formed into three spiral wings that act aspistons, is turned round within a cylindrical case. The butment B is a piece of metal whose width isequal to the thickness of the wings, or the interior breadth of the cylinder; it is made to slide…
Mechanical engineering · Mechanics · Engineering
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