. The Street railway journal . linder walls are also cooled except at the middle, where the exhaust slots are located. The cylinder is equipped with reliei valves, which serve also assafety valves. Hand-hold plates are provided for cleaning theexhaust ports. Experience has shown, however, that the insideof the cylinder remains very clean It was found that even afterlong-continuous running the exhaust ports especially remainedperfectly clean, which is the result of the violent discharge of theburnt gases occurring alternately from right and left. In engineswhere the gases are always blown out i
. The Street railway journal . linder walls are also cooled except at the middle, where the exhaust slots are located. The cylinder is equipped with reliei valves, which serve also assafety valves. Hand-hold plates are provided for cleaning theexhaust ports. Experience has shown, however, that the insideof the cylinder remains very clean It was found that even afterlong-continuous running the exhaust ports especially remainedperfectly clean, which is the result of the violent discharge of theburnt gases occurring alternately from right and left. In engineswhere the gases are always blown out in the same direction, scaleor crusts of oil are liable to form, which become intensely hot,and may eventually cause premature ignition. Formation of theoil crusts is further effectively prevented by the cool piston slidingover the bridges that separate the exhaust ports, thus keepingthe temperature of these so low that the adhering lubricating oildoes not vaporize. The engines are built in sizes ranging from 400 hp to 2000 hp,. FIG. 3.—LARGE DIRECT-CONNECTED GAS ENGINE AND ALTERNATOR by pass is also under the control of the governor. The engine,therefore, operates with a variable amount of mixture, and theair first sent into the power cylinder stays near the middle whilethe combustible mixture remains at the head of the cylinder, nearthe inlet valves and igniters. Two spark coils at the ends of thepower cylinder are operated by a separate shaft driven by spurgearing from the cam shaft, and the regulation is such that thetime of ignition can be changed during the running of the engineto suit whatever kind of gas is being used. Moreover, the pointof ignition may be set so that it will take place only after thepiston has passed the dead point. The engine may be started veryslowly without pre-ignition. The engine is started with com-pressed air; those to which a blowing cylinder is attached re-quiring less than 150 lbs. pressure and those without such cylin-ders 90 lbs. to 120 lb
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
