A history of the growth of the steam-engine . i^lG. 106.—The Lynn Water-Works Engine. quenee of the piston striking either cylinder-head. Thebeam is carried on handsomely-shaped iron columns, which,with cylinders, pump, and fly-wheel, are supported by a STATIONARY ENGINES. 337 substantial stone foundation. The pump-rod, I, works adouble-acting pump, J, and the resistance to the issuingwater is rendered uniform by an air-chamber, JK^ withinwhich the water ri^es and falls when pressures tend to vary-greatly. A revolving shaft, iVJ driven from the fly-wheelshaft, carries cams, 0 P, which move the
A history of the growth of the steam-engine . i^lG. 106.—The Lynn Water-Works Engine. quenee of the piston striking either cylinder-head. Thebeam is carried on handsomely-shaped iron columns, which,with cylinders, pump, and fly-wheel, are supported by a STATIONARY ENGINES. 337 substantial stone foundation. The pump-rod, I, works adouble-acting pump, J, and the resistance to the issuingwater is rendered uniform by an air-chamber, JK^ withinwhich the water ri^es and falls when pressures tend to vary-greatly. A revolving shaft, iVJ driven from the fly-wheelshaft, carries cams, 0 P, which move the lifting-rods seendirectly over them and the valves which they actuate. Be-tween the steam-cylinders and the columns which carry thebeams is a well, in which are placed the condenser and air-. FiG. Wl.—fiie Leavitt Pmnpiug-Engine. pump. Steam is carried at 60 or 80 poiinds^i-essure, andexpanded from 6 to 10 times. A later form of double-cylinder beam pumping-engineis that invented and designed by E. D. Leavitt, Jr., for theLynn (Mass.) Water-Works, and shown in Figs. 106 and two cylinders are placed one on each side the centre ofthe beam, and are so inclined that they may be coupled to15 338 THE STEAM-ENGINE OF TO-DAY. opposite ends of it, while their lower ends are placed closetogether. At their upper ends a valve is placed at eachend of the connecting steam-pipe. At their lower ends asingle valve serves as exhaust-valve to the high-pressureand as steam-valve to the low-pressure cylinder. The pis-tons move in opposite directions, and steam is exhaustedfrom the high-pressure cylinder directly into the nearer endof the low-pressure cylinder. The pump, of the Thames-Ditton or bucket-and-plunger variety, takes a full sup-ply of water on the down-stroke, and discharge
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