Steam engines, prepared in the Extension division of the University of Wisconsin (1919)
Shealy, Edward Marvin · New York, McGraw-Hill · leaf 163
0 and J will represent the position of the crank atcut-off when the valve displacement is again equal to the steamlap, OJ. The arc HLJ is called the steam lap circle. Fig. 87is drawn in the same way as Fig. 86, but is made separate inorder to avoid confusion. The lead of a valve is the amount of… … valve displacement for this position of the crank and OL thesteam lap, hence LM represents the lead of the valve. Theamount of port opening is always the distance between the lapcircle, and the valve circle, as shown by the shaded area in Fig.87. It should be observed that the diagram in Fig. 87…
Steam-engines
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