. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Fio. 5.).— .).—CiK-s releasing valve-gt-ar. ENGINES, STEAM, STATIONAEY RECIPROCATING. 315 ing with the functions of the steam-valve, and, once determined, are positive and fixed. Theeccentric, which determines the movement of the steam-valves, is operated by a shaft-governorin such a manner as to open the valves more or less according to the amount of steam required,varying the point of cut-off
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . Fio. 5.).— .).—CiK-s releasing valve-gt-ar. ENGINES, STEAM, STATIONAEY RECIPROCATING. 315 ing with the functions of the steam-valve, and, once determined, are positive and fixed. Theeccentric, which determines the movement of the steam-valves, is operated by a shaft-governorin such a manner as to open the valves more or less according to the amount of steam required,varying the point of cut-off, while the amount of lead remains practically constant for allloads and pressures. The point of cut-off being varied by the greater or less movement ofthe wrist-plate instead of by means of a detachable motion, and the valves being closed by a. Fig. 56.—The Payne-Corliss engine. positive connection with the wrist-plate instead of by dash-pots, high rates of rotation andthe advantages of the high-speed engine, combined with a distribution of steam to which theeconomy of the 4-valve engine is due, are rendered possible, inasmuch as the engine is notlimited by the inability of the detachable devices to act at high rotative speeds. The Westinghouse Engine.—The Westinghouse engine is the leading engine of a new typewhich has recently come into extensive use, the principal characteristics of which are (1)two or more vertical single-acting cylinders, and (2) automatic lubrication by means of aclosed chamber surrounding the crank-shaft, containing oil or oil and water. This type ofengines was originally built with two cylinders of the same size, with cranks at 180°. Largesizes are built as a compound engine, with one cylinder larger than the other. Engines onthe same general principle, butwith three cylinders and tripleexpansio
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
