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 486
r. p, a small solid piston working in a cylindrical part of the valve-chest, and attached to the valve bya short connecting-rod. Its under surface is constantly acted upon by the pressure of the steam withinthe valve-chest, so as to cause the steam-valve to assume the position indicated in Fig.…
Mechanical engineering · Mechanics · Engineering
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