Cyclopedia of locomotive engineering, with examination questions and answers; a practical manual on the construction care and management of modern locomotives (1916)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & co., pub. for Sears, Roebuck & co. · leaf 124
Figure 57 causes the exhaust port at one end of the cylinder tobe opened before the steam port at the other end isuncovered for the admission of steam. If a valve hadno outside lap it would admit steam throughout thewhole stroke, or in other words, follow full stroke. … Figure 58 Another bad effect of no lap would be a late exhaust,by which is meant that the exhaust would occur at oneend of the cylinder at practically the same momentthat admission occurred at the other end. This wouldhave a tendency to retard the motion of the piston.The term clearance, as applied…
Locomotives
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