. Revised and enlarged ed. of the science of railways . P; I i rl I TO r/f/f/f^ L/NC 7jR/j/^ l/^£ Open to /^rnojppfPfTHE T/f/?££ W/fy COCA. the connecting link between the train line andthe atmosphere for setting the brakes, or be-tween the main reservoir and the train linefor releasing, but it cannot connect the three THE AIR BRAKE. 349 simultaneously. The first engineers valve usedwas the three-way cock. Figs. Fy G and H clearly illustrate the threepositions of a three-way cock. Tlie outside rep-resents the body of the valve and the inside circlethe plug that can be turned one-fourth wayarou
. Revised and enlarged ed. of the science of railways . P; I i rl I TO r/f/f/f^ L/NC 7jR/j/^ l/^£ Open to /^rnojppfPfTHE T/f/?££ W/fy COCA. the connecting link between the train line andthe atmosphere for setting the brakes, or be-tween the main reservoir and the train linefor releasing, but it cannot connect the three THE AIR BRAKE. 349 simultaneously. The first engineers valve usedwas the three-way cock. Figs. Fy G and H clearly illustrate the threepositions of a three-way cock. Tlie outside rep-resents the body of the valve and the inside circlethe plug that can be turned one-fourth wayaround by the handle, bringing the necessaryports into communication (Figs. F and H) orclosing everything (Fig. G). KTu—H To EwTrtfUswvWl ^AJO/NfERS 3/t/}ff£ V/flVBPljflf. The engineers brake and equalizing dischargevalve with feed valve attachment and duplex airgauge is the fifth valve of a series of improve-ments in the last fifteen years. The main fea-tures of the three-way cock are still retained,however, but this valve (Fig. I) has two otherpositions, running and service application, makinga total of five positions, beginning on the left, .350 RAILWAY EQUIPMENT. namely, release, running, lap, service application,and emerrjencij. (1) Release, or full release as it is frequentlytermed in distinction from running position,brings the main drum pressure, by means of therotary valve, in direct communication with tlietrain line into which it Hows. This position isfor quickly charging the train line and auxiliaryreservoirs, also for releasing brakes. (2) Running position is but a modification ofrelease. Here the passage for the air from themain drum to the train line is smaller and con-tains (depen
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