A history of the growth of the steam-engine . ime, as required. Since compactness and lightness are not as essential asin portable, locomotive, and marine engines, the parts are STATIONARY ENGINES. 319 arranged, in stationary engines, with a view simply to se-curing efficiency, and the design is determined by circum-stances. It was formerly usual to adopt the condensingengine in mills, and wherever a stationary engine was re-quired. In Europe generally, and to some extent in theUnited States, where a supply of condensing water is ob-tainable, condensing engines and moderate steam-pressuresare
A history of the growth of the steam-engine . ime, as required. Since compactness and lightness are not as essential asin portable, locomotive, and marine engines, the parts are STATIONARY ENGINES. 319 arranged, in stationary engines, with a view simply to se-curing efficiency, and the design is determined by circum-stances. It was formerly usual to adopt the condensingengine in mills, and wherever a stationary engine was re-quired. In Europe generally, and to some extent in theUnited States, where a supply of condensing water is ob-tainable, condensing engines and moderate steam-pressuresare still employed. But this type of engine is graduallybecoming superseded by the high-pressure condensing en-gine, with considerable expansion, and with an expansion-gear ia which the point of cut-off is determined by thegovernor. The best-known engine of this class is the Corliss en-gine, which is very extensively used in the United States,and which has been copied very generally by Europeanbuilders. Fig. 97 represents the Corliss engine. The. Fig. 97.—Corliss Engine. horizontal steam-cylinder is bolted firmly to the end of theframe, which is so formed as to transmit the strain to themain journal with the greatest directness. The frame car-ries the guides for the cross-head, which are both 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 sets of valves are driven by an eccentric operating adisk or wrist-plate, E (Fig. 98), which vibrates on a pin pro-jecting from the cylinder. Short links reaching from thiswrist-plate to the several valves, D D, FF, move them with
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Keywords: ., bookcentury1800, bookdecade1870, bookidc, booksubjectsteamengines
