Journal of electricity, power, and gas . e. Ingood weather this ship makes 12 knots per hour, andin bad weather 10 knots per hour at an engine speed of 125 to 130 Each engine is of 1600 indicatedhorsepower capacity, and looks much the same as anordinary steam engine in all its parts except the valvegear. Each cylinder is provided with one exhaust andone suction valve exactly alike and mounted symmet-rically with respect to the centerline. Between thesetwo the starting air valve and the oil spray injectionvalves are located. The starting air valve is only muse during about two revolution
Journal of electricity, power, and gas . e. Ingood weather this ship makes 12 knots per hour, andin bad weather 10 knots per hour at an engine speed of 125 to 130 Each engine is of 1600 indicatedhorsepower capacity, and looks much the same as anordinary steam engine in all its parts except the valvegear. Each cylinder is provided with one exhaust andone suction valve exactly alike and mounted symmet-rically with respect to the centerline. Between thesetwo the starting air valve and the oil spray injectionvalves are located. The starting air valve is only muse during about two revolutions of the engine, and iscut out automatically during the normal operation ofthe engine. In the space just back of the oil valve, the oil ismixed with air in much the same way as steam andoil are mixed for oil burning purposes under the valve opens the mixture is injected into thecylinders under a pressure of about 60 atmospheresagainst the maximum compression pressure of 38 at-mospheres existing in the cylinders. The mixture. Cross-Section Through Busoh-Sulzer Bros. DieselEngine. now burns, keeping the pressure constant at 38 atmos-pheres until the oil valve closes and the expansioncommences. In Fig. 1 is shown a diagram taken fromone of the engine cylinders of the Siam during normaloperation. The mean effective pressure, as measured,is atmospheres, or 93 lb. per sq. in. Keeping inmind that the piston gets an impulse only every othertime it is going down, the indicated horsepower fromfrom one cylinder can be found thus: 93X^X^23!x^L4^rX 127 = 195 h. p. 4 12 X 550 60 X 2 Each cylinder is supposed to normally indicate200 It may be that the engine is supposed to 444 JOURNAL OF ELECTRICITY, POWER AND GAS [Vol. XXXII—No. 21 make more than 127 ,m., or that the card in Fig. 1is not quite a normal one. It is seen that, if the nor-mal indicated output of one cylinder is about 200 ,with p> = 93 lb. per sq. in., this engine has a largeoverload capacity,
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