. The Street railway journal . FIG. 2.—SECTIONAL VIEW end of the engine. In operation, as soon ; s the piston begins touncover the exhaust ports the pressure of the residual productsof combustion in the cylinder drops rapidly to that of the atmos-phere, enabling the inlet valve to be opened and admitting a freshcharge from the pumps. Air only is supplied at first to separatethe burnt gases from the succeeding mixture, and afterwards gasand air are admitted in proper proportions. As soon as the ex-. FIG. 1.—PLAN OF TWO-CYCLE GAS ENGINE and is backed at each end by self-closing spring rings. Two
. The Street railway journal . FIG. 2.—SECTIONAL VIEW end of the engine. In operation, as soon ; s the piston begins touncover the exhaust ports the pressure of the residual productsof combustion in the cylinder drops rapidly to that of the atmos-phere, enabling the inlet valve to be opened and admitting a freshcharge from the pumps. Air only is supplied at first to separatethe burnt gases from the succeeding mixture, and afterwards gasand air are admitted in proper proportions. As soon as the ex-. FIG. 1.—PLAN OF TWO-CYCLE GAS ENGINE and is backed at each end by self-closing spring rings. Twodouble-acting auxiliary pumps are employed for supplying thecombustible mixture, one furnishing gas and the other air, andboth proportioned so that their combined action insures a propermixture. The gas and air are compressed to about 9 lbs. persquare inch. The compression spaces of the pumps are divided haust ports are again covered by the receding piston the air anagas pump pistons reach the dead point, and the supply of thecombustible mixture is interrupted. The next step is the closingof the inlet valve when the charge is compressed in the cylinder,and ignition takes place at the dead point of the stroke. Theignited charge exerts its driving power and expands with the December 6, 1902.] STREET RAILWAY JOURNAL. 937 next movement of the main piston. Just before arriving at theother dead point the piston uncovers the exhaust ports and theconsumed charge is then blown out. The same operat
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
