Renwick, James, 1790?-1863 · New York, G. & C. & H. Carvill · leaf 247
gh theside pipe, and fill the space beneath the piston. The upper valve alone is a steam-valve, except when theengine is to be set in motion, when the second valve isopened with it, and admits steam to the lower part of thecylinder. In all other cases, the latter is merely a valve ofcommunication,… … watts single engine 241 168. Still further to diminish the loss of heat, Wattpumped back the water of condensation into the boiler;by these several improvements so great a saving of fuelwas obtained, that the patentees asked no other remunera-tion for the use of the invention, except one-third part…
Steam-engines
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