. The steam-engine and other heat-motors. of steamadmitted and its ratio of expansion. All the power of a compoundor other multiple-expansion engine could be developed in its low-pressure cylinder, disregarding for a moment the necessary strengthof parts and condensation, since, if we admitted into that cylinderthe same mass as was admitted into the high-pressure cylinder,we may expand that mass in this cylinder the same number oftimes as in the multiple-expansion engine against the same backpressure. Find the diameters of the high- and low-pressure cylinders of across-compound engine, gage pr
. The steam-engine and other heat-motors. of steamadmitted and its ratio of expansion. All the power of a compoundor other multiple-expansion engine could be developed in its low-pressure cylinder, disregarding for a moment the necessary strengthof parts and condensation, since, if we admitted into that cylinderthe same mass as was admitted into the high-pressure cylinder,we may expand that mass in this cylinder the same number oftimes as in the multiple-expansion engine against the same backpressure. Find the diameters of the high- and low-pressure cylinders of across-compound engine, gage pressure at the boiler, 150 pounds;total ratio of expansion, 16; ratio of low-pressure cylinder area tothat of the high, 4 to 1; assumed diagram factor derived fromengines of about the same power and of the same general design,83%; back pressure in the condenser is 1 pound absolute; revo-lutions, 120; horse-power, 1000, stroke, 42. 316 THE STEAM-ENGINE AND OTHER HEAT-MOTORS. A B Boiler Pressure Low Pressure Head End 10 5 atmospherio -5 -10. Pressure in Condenser Fig. 1G2. MULTIPLE-EXPANSION ENGINES. 317 Expected mean effective pressure j 165 (1+log, 16) 1 QQ= i r-^— 1 }? .83 = 31 Ao pounds. For cards, see Fig. 111. X innn ^nrr „., nnn = 1000. .. A = 12o0 or d = 40. oo,UUU The diameter of the high-pressure cylinder is 20. Cut-off inthe high-pressure cylinder is at a little less than 1/4 stroke. Assume clearance in high-pressure cylinder is 5%, and in thelow is 7%, and that the volume of the receiver equals the volumeof the cylinder. To Combine Indicator-cards of a Compound Engine.—TheCombined Diagram is a hypothetical figure, which in its essentialfeatures represents an indicator-diagram which would be obtainedif the whole process of admission, expansion, and exhaust occurredin one cylinder, viz., the low-pressure cylinder. It is a diagramfrom which the pressure of the steam at any point in the strokeof either cylinder, and the volume of that steam, ca
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