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
to escape before the pis-ton commences the return stroke. Fourth, it mustnot permit live steam to enter the exhaust port directfrom the steam chest. Fifth, it must close each steamport on the steam side before it is opened on the I2C LOCOMOTIVE ENGINEERING exhaust side; this is for the purpose of… … 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 !
Locomotives
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