. A manual of marine engineering: comprising the design, construction, and working of marine machinery. Fit,. 226. TM = (fig. 226), or, taking the second approximation to the series in terms of ^, as in thecase of the acceleration (par. 4), T M = P r ( sin ^ + sin 2 6\ In order to combine the inertia curve with the indicator diagram orsteam pressure curve, the same spacing of ordinates for each must beadopted. If the inertia curve be drawn with indicator diagram spacing otordinates (that is, the abscissse are proportional to the distance of the pistonfrom the end of the stroke) instead of absc
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. Fit,. 226. TM = (fig. 226), or, taking the second approximation to the series in terms of ^, as in thecase of the acceleration (par. 4), T M = P r ( sin ^ + sin 2 6\ In order to combine the inertia curve with the indicator diagram orsteam pressure curve, the same spacing of ordinates for each must beadopted. If the inertia curve be drawn with indicator diagram spacing otordinates (that is, the abscissse are proportional to the distance of the pistonfrom the end of the stroke) instead of abscissfe proportional to 6, it willassume the form shown in fig. 2276 by the line 0 K. If cos 2 ^ or theobliquity of the connecting-rod be neglected, the curve will be a straightline. The ordinates must of course be to the same scale as the steampressure ordinates. Considering the dead weight alone of the moving parts, the reciprocating 572 MANUAL OF MARINE ENGINEERING. Fig. 227b Fig. 227c 12 stroke. IZp ISp ISp 2tQ Z4() Zip 30p ^3p ; THE EFFECT OF INERTIA AND WEIGHT. 573 parts having their motion controlled by the connecting-rod must necessarilyhave their weight added algebraically to the inertia force. But the rotatinofparts also cause a twisting moment on the shaft which, if M., equal theirweight at radius r, is equal to Morsin {& + <p), where <p is the angle betweenthe resultant M^ of all rotating masses and the crank. If there are nobalance weights and valve gear be neglected, (p = 0. Mg not being con-trolled by the length of the connecting-rod cannot be considered as beingdistributed over the piston area (except for a connecting-rod of infinitelength) and the effect of the weight of the rotating parts must therefore beconsidered apart from the indicator diagram. Then (fig. 2276) the weight of the reciprocating parts being a constant Mquantity, set ofi H C = —^ downwards for the downstroke and upwards for the upstroke, and draw a curve, H N, thr
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