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 122
weenthe lines O P. Inside lap, frequently referred to asexhaust lap, is that portion of the valve that overlapsthe two bridges of the valve seat when the valve standscentral, and is shown at A and A, Fig. 59. VALVES AND VALVE GEAR 121 Inside clearance, sometimes called exhaust lead, isthe space… … Figure 55 i larch is slightly greater than the distance between theinside edges-of the steam ports, so that it does notentirely cover them when in its central position.Inside clearance is shown at B and B, Fig. 60. Thepurpose of inside lap is to delay the release of the
Locomotives
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