. Science of railways . he vent maybe piped to any convenient discliarge point, as, forinstance, up the back of the stack.* The application of the apparatus to a locomotive,and the relative arrangement of the parts, is shown byFigs. 1,2, 3 and 4. Figs. 1,2 and 3 show the applicationto a locomotive fitted with double exhaust nozzles, *The reader is referred to the plate of the American Type Locomotive, to arrive ata clear understanding of the location of the ordinary locomotive parts herein referred to. LOCOMOTIVE APPLIANCES. 529 while Fig. 4 shows a possible alternative applicationto a locomot
. Science of railways . he vent maybe piped to any convenient discliarge point, as, forinstance, up the back of the stack.* The application of the apparatus to a locomotive,and the relative arrangement of the parts, is shown byFigs. 1,2, 3 and 4. Figs. 1,2 and 3 show the applicationto a locomotive fitted with double exhaust nozzles, *The reader is referred to the plate of the American Type Locomotive, to arrive ata clear understanding of the location of the ordinary locomotive parts herein referred to. LOCOMOTIVE APPLIANCES. 529 while Fig. 4 shows a possible alternative applicationto a locomotive fitted with a single exhaust nozzle; inthe former case, however, two small drums were usedinstead of one large drum, owing to the fact that theintervening space was already occupied by the mainreservoir of the air brake system. The arrangementof parts for the double exhaust locomotive (Figs. 1, 2and 3) is as follows: The openings in the top of the cylinder saddles,marked e e^ Fig. 2, are the points where the exhaust. Fig. 2. Huff Automatic Variable Exhaust. (Plan View.; base and nozzles are attached; c c are the pipes whichare tapped into the exhaust; d is a cross-pipe connect-ing the two; b b are the drums; i i are gate valvesinserted into the pipes c c back of the cross-pipe d. Themechanism for operating the gate valves from the hftshaft in this case involves the use of special slidesworking in guide bases which are attached to theframes, the sHdes being made with inchned slotswhich engage rollers attached to the vertical stems ofthe gate valves. As the shdes have a horizontal i30 LOCOMOTIVE APPLIANCES. motion, imparted by connections from the lift shaft,the gate valves have their maximum opening whenthe reverse lever is in dther extreme position, andtheir minimum opening when the reverse lever is inmid-gear. The several parts comprised in this mech-anism for working the gate valves from the hft shaftare shown in Fig. 1 and marked /, g, h, 2, 3, 4, 5, 6,7, 8 and 9. An aux
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