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 149
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 farther ahead of the… … on the dead center, the first function of the valve islead or admission, illustrated by Fig. 14. Owing tothe valve having both lap and lead, the position of thehighest point of the eccentric will be assumed in thiscase to be 1200 ahead of the crank, the position of thelatter being at o°. Exhaust…
