s 50 tuns. The whole engine is of massive propor-tions, but the only detail of which we need speak here is theslide valve, which is shown in detail by Figs. 4 and 5. Thisis Hemphills balanced slide valve, which, as shown, moves be-tween the usual face and a relief plate. The relief plate… … minus the area required to secure a sufficient downwardipressure to hold the valve firmly to its face. The relief plateis thus held between two forces, the pressure of the steamdownward on an area equal to that of the valve, and thepressure upward on the diaphragm. The set bolt, shown at the top of…
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