Twentieth century hand-book for steam engineers and electricians, with questions and answers .. (1905)
Swingle, C. F. [from old catalog], Horstmann, Henry Charles, 1858- [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] · Chicago, F. J. Drake & co. · leaf 148
The valve is representedat mid travel or in its central position. S P, S P arethe steam ports, and E P is the exhaust port. Theprojections marked X at each foot of the arch inside 0 L 1 1 1 1 s*^ 0 L 1 |l |1 k ^^^^ \ l ^S *L* *A JP^i FIGURE 13. Wpy@ the valve, represent inside lap and may be added… … FIGURE 14. of the eccentric. If the valve had neither lap nor leadthe position of the eccentric on the crank shaft wouldbe just 900 or one-quarter of a circle ahead of thecrank, but as more or less lap as well as lead isrequired, it becomes necessary to move the eccentric 136 ENGINEERING still…
