Hutton, Frederick Remsen, 1853- [from old catalog] · New York, J. Wiley & sons; [etc., etc.] · leaf 274
an indicator bearing a graduated scale can easily be attachedto the valve-stem connection, so as to indicate the effectivelength of the valve from out to out, and the point of cut-offwhich belongs to each particular length of the valve. Fig. 198 presents a scheme for securing a variable lap by … means of a similar secondary motion of adjustment for the rodof the cut-ofT valve. It will be observed that the ports andcut-off valve are trapezoidal in plan, so that if the valve besliding back and forth in the position indicated it will have acertain lap with respect to the length of the ports.…
Mechanical engineering · Steam power plants
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