Locomotive catechism; an up-to-date, practical and complete work on the locomotive--treating on the design, construction, repair and running of all kinds of locomotives .. (1908)
Grimshaw, Robert, 1850- [from old catalog] · New York, The N. W. Henley publishing company · leaf 240
rlapping of the valve edges when in central posi-tion, just enough to prevent leakage into or from the ports,without being sufficient to be noticeable as lap. THE SLIDE VALVE. 233 Q. Why will steam not enter the cylinder when the valve ison at mid-travel? A. Because both steam ports are closed by… … Fig. 135 Slide Valve with Lap Added.
Locomotives
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