. Electric railway review . Thisform is not adapted to large sizes, it being expensive, if notimpossible, to build, and requiring a great deal of oil. Mostof the engines have been and are being built on the 4-cycreprinciple, there being, so far as I know, but one large manu-facturer of 2-cycle engines. In the last few years the large steam engine manu-facturers, such as the Allis-Chalmers Company, the SnowSteam Pump Company and the Westinghouse Machine Com- double-actmg cylinders. The valves are always poppetvalves, both intake and driven from a lay shaft paral-lel with the cylinder.
. Electric railway review . Thisform is not adapted to large sizes, it being expensive, if notimpossible, to build, and requiring a great deal of oil. Mostof the engines have been and are being built on the 4-cycreprinciple, there being, so far as I know, but one large manu-facturer of 2-cycle engines. In the last few years the large steam engine manu-facturers, such as the Allis-Chalmers Company, the SnowSteam Pump Company and the Westinghouse Machine Com- double-actmg cylinders. The valves are always poppetvalves, both intake and driven from a lay shaft paral-lel with the cylinder. As this problem has been taken up independently by thesethree large and successful steam engine builders, and all havearrived at practically the same solution, it is safe to say thatthe gas engine of the immediate future will be of this type. At the Medford power station the equipment consists ofthe following: Gas House.—Five up-draught water-sealed gas producers,9 feet in diameter. One auxiliary steam boiler, coal Gas Prodjcers of Power otation. pany, have been making large gas engines, and there havebeen a considerable number of engines of from 2000-horse-power and upward run during the past year, so that todaythere is no trouble in purchasing engines of standard designin the large sizes. All three of these companies have adoptedthe successful designs of steam engines to the gas engines,.using disc-cranks and double-acting cylinders, generally two One 40-h. p. engnie, for blowers and tar extractors. Fiveeconomizers for preheating the air for producers. Five wetscrubbers. Two tar extractors. Two sawdust purifiers. One1,5,000 cu. ft. gas holder. Engine Room.—Three single-cylinder Koerting, gas engines; cylinder, 2554 inches diameter by4.; inches stroke: speed, 100 revolutions per minute; rated October 17. 1906. ELECTRIC RAILWAY REVIEW 753 c;ipacity, .iOO l)r:ikc-h. p.; duplicate ••inaUe-niid-brenk electricaligniters; igniter c
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