Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 400
one of two things,either to increase the outside lap, which would have atendency to cause admission to occur too late, or the angleof advance may be increased sufficient to cause cut off to Valves and Valve Setting 387 take place at half stroke, but to do this alone would causeadmission to occur… … Fig. 129 °, where before it was 30°, as in vance, A B C, is now 50Fig. 125. The valve is central when the crank is at position 1;the high point of the eccentric being at point 4. The out-side lap, which before was 1 in., has had 7/16 in. added 388 Steam Engineering to it, making it 1 7/16 in. When…
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