Railway and Locomotive Engineering . de-sired. In the drifting and relief valve hereinillustrated, the human element is nottaken into consideration, its operation be-ing absolutely automatic. It will be notedthat the drifting valve is combined withthe ordinary form of relief valve. Throughits operation steam is admitted at theopening marked A. When the engineis moving, the piston B drops down,thereby closing the openings in the re-lief valve for the admission of air andopening the port C for the admissionof steam, consequently when the throttleis closed no outside air can be admittedto the cyl
Railway and Locomotive Engineering . de-sired. In the drifting and relief valve hereinillustrated, the human element is nottaken into consideration, its operation be-ing absolutely automatic. It will be notedthat the drifting valve is combined withthe ordinary form of relief valve. Throughits operation steam is admitted at theopening marked A. When the engineis moving, the piston B drops down,thereby closing the openings in the re-lief valve for the admission of air andopening the port C for the admissionof steam, consequently when the throttleis closed no outside air can be admittedto the cylinder, but instead steam imme-diately flows in, thereby preventing anycarbonization. through accidental or intentional handling When the engine is standing a small ^^ safety feature has been disen-amount of steam is admitted under thepiston, forcing it downwards, so that anysteam in the cylinders is free to escapethrough the openings. The device com-bines with it an important safety feature,in that if the throttle should be leaking. SECTION OF COMBINED DRIFTING ANDRELIEF VALVE. A Plea for the Railroad Shop Men. By T. Brown, Shop Supt., New editorial published in the April is- _ sue of AND LOCOMOTIVE EnGI- the relief valve can be manually forced to neering on the subject of The Clamoran open position, thereby preventing the for Shorter Hours, has been widely dis- accumulation of pressure in the cylindersThis safety feature is also valuable forengines standing in the roundhouse, inthat the relief valve will be held oflf itsseat so that engine cannot be moved cussed among railway men, the consensusof opinion being that the shop men havefound a real champion in the most popu-lar and the most independent railwayperiodical. You will pardon me, however, in stating my opinion that I think the ar-ticle might have gone a step further andinsisted on the necessity of giving someattention to the shop men first. From the standpoint of a shopman withyears of experience and clo
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