. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . he piston, at the time when it is most needed. It alsopermits an earlier cut-off, in addition to providing acushion against the piston as it nears the completion ofits stroke, which prevents the lost motion in the recipro-cating parts from causing the engine to pound. The steam lap is that part of the valve which over-laps the inside edge of the when the valvestands centrally upon the valve-seat. It is that part ofthe valve marked L, and is indic
. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . he piston, at the time when it is most needed. It alsopermits an earlier cut-off, in addition to providing acushion against the piston as it nears the completion ofits stroke, which prevents the lost motion in the recipro-cating parts from causing the engine to pound. The steam lap is that part of the valve which over-laps the inside edge of the when the valvestands centrally upon the valve-seat. It is that part ofthe valve marked L, and is indicated by the space be-tween lines M 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 cut-off, and enables the engine to work steam ex-pansively. DIRECT AND INDIRECT MOTION VALVE GEARS. Both outside and inside admission valves haveeither direct or indirect motion, according to the po-. 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 suspended and movein the same direction.
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Keywords: ., bookauthornationalcorrespondenc, bookcentury1900, bookdecade1900
