. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . -ginning of the stroke. 33. By steam side lap is meant theamount of the valve overlaps the steam ports, when the valve is on the middleof the seat. 34. Exhaust side lap is the amount theinner edge of the valve overlaps thesteam ports when the valve is in themiddle of the seat. Exhaust side clearance is the amountthe inside edge of the valve comes shortof covering the ports when the valve isin the middle of the seat. 35. If the valves are the inside admis-sion indirect, necessitating a rockers
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . -ginning of the stroke. 33. By steam side lap is meant theamount of the valve overlaps the steam ports, when the valve is on the middleof the seat. 34. Exhaust side lap is the amount theinner edge of the valve overlaps thesteam ports when the valve is in themiddle of the seat. Exhaust side clearance is the amountthe inside edge of the valve comes shortof covering the ports when the valve isin the middle of the seat. 35. If the valves are the inside admis-sion indirect, necessitating a rockersliaft. the erccntric; w^uld lean toward when the crank pin is on the forwarddead center; the eccentric rods with theou;sidc admission direct arc also crossedwhen the crank pin is on the forwarddead center. These positions of the eccentrics arenecessary with the corresponding valvemotions to secure correct n>\enicnl ofthe valves. 36. Changing the length of the eccen-tric rods will either increase or decreasethe travel or produce an uneven travelof the valve over the ports, causing eith-. .Ill. \ Its R.\\Y, SWir/.i:KLAND, I.^SSING THE WOLFORT GORGE.(Courtesy of the Scientific American^ the fire box when the main pin is onthe forward dead center; while an out-side admission indirect has the belly ofthe eccentrics leaning toward the With an inside admission direct and atransmission bar, both eccentrics leantoward the pin; while with the outsideadmission direct the eccentrics have thesame position as with the inside admis-sion indirect. With the inside admissionindirect the eccentric rods are crossed, er a too early or too late admission andrelease. It depends entirely on whetherone or both rods have been shortenedor lengthened. It aflEects the engine inthat a too early admission on one endwould give a too early release, and atoo late admission a too late releaseon the other end. Changing the lengthof the eccentric rods does not affectthe valve lead. Positiv
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