A history of the growth of the steam-engine (1878)
Thurston, Robert Henry, 1839-1903 · New York, D. Appleton · leaf 345
in thesame vertical plane. The valves are four in number, asteam and an exhaust valve being placed at each end of theeteam-cylinder. Short steam-passages are thus secured, and 320 THE STEAM-ENGINE OP TO-DAT. this dimimition of clearance is a source of some economy.Both sets of valves are driven by… … Fio. 98.—CorKss Engine Valve-Motion. a peculiarly varying motion, opening and closing them rap-idly, and moving them quite slowly when the port is eithernearly open or almost closed. This effect is ingeniouslysecured by so placing the pins on the wrist-plate that theirline of motion becomes nearly…
Steam-engines
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