Steam engines, prepared in the Extension division of the University of Wisconsin (1919)
Shealy, Edward Marvin · New York, McGraw-Hill · leaf 209
direction of rotationof the engine. Thepoint of cut-off ischanged as the block ismoved from the centerof the link towards theend. The latest cut-offoccurs when the block isat the end of the link forthen the valve travel isgreatest and the valveuncovers the steamports the greatestamount. As the… … REVERSING MECHANISMS 195 stant for all positions of the block in the link. This is one ofthe points of difference between the Stephenson link motion andthe Walschaert valve gear. The former varies the lead fordifferent points of cut-off and the latter keeps the lead constant.A valve gear may be…
Steam-engines
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