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 339
ed before thepiston is at stroke beginning—what is said of the valve? A. That it has positive lead (usually called simply lead),advance, or pre-admission. Q. What is the measure of the linear lead {or simply thelead) of a valve? A. The amount that the port is open at the moment thecrank passes the… … Fig. 230. Slide Valve showing Lead. Q. What may be said of expressing amount of lap and leadin inches? A. It is nonsensical and misleading. A given lap or lead ininches of valve travel or of piston stroke might be right for * See also under Angular Advance of Eccentrics. LEAD. 333 one length or…
Locomotives
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