. A manual of marine engineering: comprising the design, construction, and working of marine machinery. ., draw a curve, which represents the curve ofstrain on the shaft during the forward movement of the piston ; by producingA B, and going through a similar operation for the second half of the revolu-tion, the curve of strain during the backward movement of the piston can beobtained. CURVE OF TWISTING MOMENTS. 183 Divide the area enclosed between this curve and the line A B by thelength of A B, and the quotient is the mea7i twisting moment, and repre-sented by A M in fig. 55, so that the rect
. A manual of marine engineering: comprising the design, construction, and working of marine machinery. ., draw a curve, which represents the curve ofstrain on the shaft during the forward movement of the piston ; by producingA B, and going through a similar operation for the second half of the revolu-tion, the curve of strain during the backward movement of the piston can beobtained. CURVE OF TWISTING MOMENTS. 183 Divide the area enclosed between this curve and the line A B by thelength of A B, and the quotient is the mea7i twisting moment, and repre-sented by A M in fig. 55, so that the rectangle A M N B is equal in area tothe figure ABC. The value of A M may be calculated by taking a mean of the values ofa-J)^ aj).„ <fec. When there are two engines, that is, two pistons operating on one shaft,the combined twisting moment is found by drawing the curve of twistingmoments of each crank separately, transposing that of one on that of theother in a position corresponding to the relative position of the cranks. Infig. 56 A C B is the curve of strain on one oiauk, and A^C^B^ that on the. Fig. 55.—Curve of Twisting Moments.
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