Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 540
ut 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 thecylinder. In other pumps the flaps, instead of acting as butments, are made to perform the part of pistons;this is… … In I is movable. A formed into three Bpiral wings that act as pistons, U turned round within a cylindrical case. The butment B 1- a piece of metal whose width is if the wings, or the interior breadth of the cylinder; it is made to slide through ring box en the ton of the case, ami by it- ux ight to…
Mechanical engineering
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