. The Street railway journal . : Diameter of high-pressure cylinder, 29 ins. (725 mm) ; diameter of low-pressure cylinder, 48 ins. (1200 mm) ; length of stroke, 54ins. (1350 mm). The number of r. p. m. is 94, and withan initial steam pressure of 147 lbs. (11 atm.), the en-gines develop from 1500 hp to 2000 hp each. In view of the « 898 STREET RAILWAY JOURNAL. [Vol. XX. No. 23. great and instantaneous variations of load the enginesare of especially heavy construction. Both engines arejacketed and the steam has to pass through the jacket toreach the steam valves. The cylinder heads are also jack
. The Street railway journal . : Diameter of high-pressure cylinder, 29 ins. (725 mm) ; diameter of low-pressure cylinder, 48 ins. (1200 mm) ; length of stroke, 54ins. (1350 mm). The number of r. p. m. is 94, and withan initial steam pressure of 147 lbs. (11 atm.), the en-gines develop from 1500 hp to 2000 hp each. In view of the « 898 STREET RAILWAY JOURNAL. [Vol. XX. No. 23. great and instantaneous variations of load the enginesare of especially heavy construction. Both engines arejacketed and the steam has to pass through the jacket toreach the steam valves. The cylinder heads are also jack-eted in connection with main jacket. The low-pressure cylinder is connected to the bayonet trip device, the advantage claimed for which is that thevalve can be raised slowly, and tnus without shock from itsseat, and then opened quickly. As will be seen, rollinglevers are used with air buffers of special device. Silentrunning is thus obtained, especially with small loads-. The governor is of the high-speed Porter type, driven. PLAN AND SECTION OF 2000-HP ENGINE frame and the high-pressure behind, so as to reduce theheat transmitted to the frame. Each cylinder has four valves for the distribution ofsteam. These, as shown in the cylinder sections, are four-seated poppet valves by which the valve lift is reduced, andquick closure is obtained without throttling the steam. The steam and exhaust valves of the low-pressure cylin-der, as well as the exhaust valves of the high-pressure cylin-der, are moved by means of cams which can be adjusted byhand to change the amount of load and compression. Thevalve gear for the high-pressure steam valves is a patented from the revolving gear shaft by means of a worm will regulate the cut-off in the high-pressure cylinderfrom o to 60 per cent. The cut-off in the other cylinderscan be varied by hand. The speed of the engine can bechanged by means of a weight sliding on the governor lever. The pistons are made in one piece. The piston rings
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
