. The steam-engine and other heat-motors . Eng. Tests Fig. 166. first by the ratio of the length of the high-pressure diagram to thedistance AB, and then by the ratio of the distance CD to thelength of the low-pressure diagram. Diagram Factor.—The Committees definition of the DiagramFactor was given in the case of simple engines. In Fig. 167 thediagram factor is the proportion borne by the area of the two iVCie determined for the high-pressure diagram in thesame way as US in Fig. ^j- Pressure J \ . ^ Zero Line of Pressure ^ JM Line of Pressurein Condenser Fig 167. 323 324 TH
. The steam-engine and other heat-motors . Eng. Tests Fig. 166. first by the ratio of the length of the high-pressure diagram to thedistance AB, and then by the ratio of the distance CD to thelength of the low-pressure diagram. Diagram Factor.—The Committees definition of the DiagramFactor was given in the case of simple engines. In Fig. 167 thediagram factor is the proportion borne by the area of the two iVCie determined for the high-pressure diagram in thesame way as US in Fig. ^j- Pressure J \ . ^ Zero Line of Pressure ^ JM Line of Pressurein Condenser Fig 167. 323 324 THE STEAM-ENGINE AND OTHER HEAT-MOTORS. combined diagrams to the area CNHSK. In Fig. 167 the distanceCN for the high-pressure cylinder is found in the same manner asin the case of the simple engine. . The mean effective pressureof the ideal diagram can readily be obtained from the formula P ^(1+hyp. log R)-p, where P is the absolute pressure of the steam in the boiler, R the MJ ratio Y^-r, and p the pressure of the atmosphere or in the con- denser. f Diagram factors for compound engines: High-speed, short-stroke, unjacketed 60 to 80% Slower rotational speeds 70 85 jacketed 85 90 Corliss 85 90 Triple-expansion 60 70 (See Vols. XXIV and XXV, Trans. A. S. M. E.) Jacketing, reheaters, and superheaters modify the diagram factor considerably. In marine engines these factors are much lower. Bauer and Robertson, Marine Engines and Boilers, give: Expansion in a single-cylinder: Large slow-s
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