Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules (1908)
National correspondence school of railroading, Chicago. [from old catalog] · [Chicago] · leaf 194
and M in Plate 51. The exhaust lap is that part of the valve which over-laps the outside edge of the inside bridge of the valve-seat when the valve stands centrally on its seat, as shownin Plate 51 and indicated by the space between linesP and Q. A valve is given lap for the purpose of hasteningthe… … PLATE 63. 184 VALVE MOTION. sition of the eccentrics on the shaft and the type ofrocker arm used. A direct motion valve gear (Plate 63) is one whichtransmits the motion of the eccentric to the valve directby means of the transmission bar and the rocker shaft,upon which both rocker arms hang…
Locomotives
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