. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . mediate cylinder tothe right hand leg of the / connection(29) and, thence, through the pipe (27)to the steam chests of the locomotive. At the same time, the from thestoker and the air compressor follows theline of least resistance and flows throughthe intermediate cylinder into the lefthand leg of the V connection (29) andso out through the pipe (27) to thesteam chests. This condition continues inoperation as long as the throttle is closed. As soon as the throttle is opened and apres
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . mediate cylinder tothe right hand leg of the / connection(29) and, thence, through the pipe (27)to the steam chests of the locomotive. At the same time, the from thestoker and the air compressor follows theline of least resistance and flows throughthe intermediate cylinder into the lefthand leg of the V connection (29) andso out through the pipe (27) to thesteam chests. This condition continues inoperation as long as the throttle is closed. As soon as the throttle is opened and apressure of iS lbs. per sq. in., has been builtup in the steam chests, this pressure act-ing on the left hand side of the piston(11) overcomes the differential of theboiler pressure on the pistons (13 and 12)and moves the whole system to the rightand into the closed position. In this position, the exhaust from thestoker and the air compressor passesdirectly through the intermediate cylinderand out at the exhaust pipe (26) andinto the atmosphere, being cut off fromthe V connection (29) by the left hand. ROBERTS DRIFnNG VALVE IN DRIFTING POSITION. April, 1922 RAILWAY AND LOCOMOTIVE ENGINEERING 95 piston (13). At the same time right handpiston (13) has moved to the right so asto cut off the flow of boiler pressuresteam to the K connection, and the con-nections between the exhaust and the livesteam with, the steam chests is auto-matically closed. The by-pass pipe (34) is located, as itis, solely for the purpose of acting as aninsurance that there shall never be anychoking of tlie exhaust by any sticking ofthe pistons. Reconstruction of the ExperimentalLocomotive at Purdue University The locomotive used by the Purdue Uni-versity in conducting elaborate tests, andwhich was originally installed under •thesupervision of Prof. W. F. M. Goss. thenDean of the Schools of Engineering, andwhich has subsequently undergone severalmodifications, chiefly by the application ofnew devices will be ag
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