. The steam-engine and other heat-motors . ying out a combined diagram isshown in the appended cuts, Figs. 163 and 165, the first of whichrefers to a Corliss compound engine (receiver engine), in which theratio of volumes of the two cylinders is as to 1, and the clear-ance of the high-pressure cylinder is 4 per cent, and of the low-pressure cylinder is per cent; and the second to a Westing-house compound engine (Woolf engine), in which the ratio of thevolumes is as to 1, and the clearance 33 per cent and 9 percent respectively. t In the single cards the high- and low-pressure dia
. The steam-engine and other heat-motors . ying out a combined diagram isshown in the appended cuts, Figs. 163 and 165, the first of whichrefers to a Corliss compound engine (receiver engine), in which theratio of volumes of the two cylinders is as to 1, and the clear-ance of the high-pressure cylinder is 4 per cent, and of the low-pressure cylinder is per cent; and the second to a Westing-house compound engine (Woolf engine), in which the ratio of thevolumes is as to 1, and the clearance 33 per cent and 9 percent respectively. t In the single cards the high- and low-pressure diagrams are ofapproximately the same length. Since there is a radical differencein the volumes represented by the lengths of the cards, there mustbe a radical difference in their scale of volumes. Similarly thescale of pressure in each card is different. In the combined dia-gram there is only one scale of volumes and one scale of pressure. t Standard Engine Tests. 318 THE STEAM-ENGINE AND OTHER HEAT-MOTORS. COMBINED -i 130 120 no 100 90 30 70 60 50 40 30 20 10 >f«~>t ^4«-*{ ^ MULTIPLE-EXPANSION ENGINES. 319 To Draw the Combined Diagram.—Draw any line to representthe clearance line as in Fig. 163. Perpendicular to it, at any givenpoint, erect a line, called the zero line, whose assumed length willrepresent the volume of the low-pressure cylinder plus the clear-ance. Lay off this clearance. Divide the remainder into anynumber of parts and divide the atmospheric line of the low-pressurediagram (limited by the end ordinates of the diagram) into thesame number of parts. Draw ordinates through these points andlay off in the combined diagram (in accordance to its assumed h. P. CYL
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