. The American railway; its construction, development, management, and appliances . c c andd d, which connect its ends with a box, U, call-ed a steam-chest, to which steam is admittedfrom the boiler by a pipe, y. The two passages c and d haveanother one, g, between them, which is connected with the chim-ney. These passages are covered by a slide-valve, V, whichmoves back and forth in the steam-chest, alternately uncovering theopenings c and d. When the valve is in the position shown in Fig-ure 20, obviously steam can flow into the front end A of the cylinderthrough the passage c, as indicated
. The American railway; its construction, development, management, and appliances . c c andd d, which connect its ends with a box, U, call-ed a steam-chest, to which steam is admittedfrom the boiler by a pipe, y. The two passages c and d haveanother one, g, between them, which is connected with the chim-ney. These passages are covered by a slide-valve, V, whichmoves back and forth in the steam-chest, alternately uncovering theopenings c and d. When the valve is in the position shown in Fig-ure 20, obviously steam can flow into the front end A of the cylinderthrough the passage c, as indicated by the darts. The valve has acavity, H, underneath it. When this cavity is over the passage dand g, it is plain that the steam in the back end A of the cylindercan flow through d and g and then escape up the chimney. Underthese circumstances the steam in the front end A of the cylinderwill force the piston B to the back end. When it reaches the backend of the cylinder the valve is moved into the position shown inFigure 21, and steam can then enter d and will fill the back endy^. Fig. 19.—Injector used on Loco-motives. ii8 AMERICAN LOCOMOTIVES AND CARS.
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