. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . d chambers u-uare filled with steam and the overpass valves are heldclosed (Fig. 1, Plate 120). When the throttle is closedand the locomotive is allowed to drift, a vacuum forms inthe steam-chest. This causes a vacuum to be formed inchambers u-u on each side of the overpass valves and thevalves are forced apart. This opens passage BB fromone end of the cylinder to the other, and the air that isbeing compressed ahead of the piston is free to flow intothe other e
. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . d chambers u-uare filled with steam and the overpass valves are heldclosed (Fig. 1, Plate 120). When the throttle is closedand the locomotive is allowed to drift, a vacuum forms inthe steam-chest. This causes a vacuum to be formed inchambers u-u on each side of the overpass valves and thevalves are forced apart. This opens passage BB fromone end of the cylinder to the other, and the air that isbeing compressed ahead of the piston is free to flow intothe other end of the cylinder (Fig. 2, Plate 120), thuspreventing to a considerable extent the formation of avacuum. The space between the valves is connected 266 COMPOUND LOCOMOTIVES. with the atmosphere through the small vent P, as it hasbeen found advisable to admit some external air in orderto prevent the cylinders from becoming overheatedthrough the heat generated in churning the air back andforth in the cylinder. The vent also aids in preventingthe formation of a vacuum. The overpass valves areused only on the low pressure FIG. 1—PLATE 120.
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