Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 234
A- i … Fig. 420. For common engines the cut-off is effected by the lap and lead of the valve (Fig.420), When the valve is placed centrally over the ports, the portion of the valve over-lapping the steam ports is known as lap; when on the steam side, it is designated asoutside lap, and as inside lap when…
Mechanical drawing
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