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 121
Figure 53 shows the valve in its central position and explains \the meaning of the word lap. Outside lap, oftenreferred to as steam lap, is the distance that the edge 1of the valve overlaps the steam ports when it standscentral or at mid-travel, and is that portion of the ! … Figure 54 valve marked L and indicated by the distance betweenthe 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…
Locomotives
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