. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . n of steam is obtained, and it canbe operated so that its power can be increased. SCHENECTADY TWO-CYLINDER TYPECOMPOUND. This type of compound can be operated as a simpleengine by turning the handle of the three-way cockin the cab, which is moved by hand to admit airor steam into the pipe, which connects with oneend of separate exhaust valve chamber A (Plate 118),forcing the separate exhaust valve from right to leftagainst the tension of the spring S. When the
. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . n of steam is obtained, and it canbe operated so that its power can be increased. SCHENECTADY TWO-CYLINDER TYPECOMPOUND. This type of compound can be operated as a simpleengine by turning the handle of the three-way cockin the cab, which is moved by hand to admit airor steam into the pipe, which connects with oneend of separate exhaust valve chamber A (Plate 118),forcing the separate exhaust valve from right to leftagainst the tension of the spring S. When the throttleis open steam is admitted to passage E leading to the in-tercepting valve, forcing the valve from left to right andpermitting the steam to pass through the valve and portsG, from which it passes through the reducing valve to thelow pressure steam-chest. Steam is also admitted di-rectly from the steam-pipe to the high pressure steam in the high pressure cylinder exhausts throughthe receiver and separate exhaust passage, while thesteam in the low pressure cylinder exhausts in the same 260 COMPOUND COMPOUND LOCOMOTIVES. 261 manner as when working in compound position. Plates118 and 119 are self-explanatory, showing clearly thetravel of the steam when working as a simple or as acompound engine. The purpose of the oil dashpot is to insure a steadymovement of the valve without shock. The dashpotshould be kept full of engine oil, which will assist theintercepting valve in maintaining a steady there is no oil in the dashpot it will allow, the inter-cepting valve to slam, this being the usual cause of thevalve breaking. The two-cylinder compound is changed from simpleto compound by returning the three-way cock to itsnormal position, which will permit the pressure to bewithdrawn from the piston head of the separate exhaustvalve. This allows the compressed spring to force theseparate exhaust valve to its normal position, closing thecommunicat
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