The internal combustion engine; a text-book for the use of students and engineers (1915)
Wimperis, Harry Egerton, 1876- · New York, D. Van Nostrand company · leaf 149
of these mid-ordinates arethen measured and their sum divided by the number of them. * In the case of a four-stroke engine it might at first sight seemdesirable to divide the average pressure over the two outward strokesand not on one of them only, but the accepted conventio n is that givenin the… … Fig. 41.—Obtaining Area by Mid-ordinate Rule. Area C D E counts aspositive ; area A B as negative. Mid-ordinate height of negative loopmust be subtracted from that of positive loop. 90. Effect of Engine Speed.—The Crosby indicator abovedescribed is well suited to gas engines running at normal
Internal combustion engines
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