. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . re theside play to piston crosshead and lost the cut-off occurs in the back of thecylinder is of considerable importance,referring as it does in the case of a pis-ton where the piston rod does not ex-tend through the front cylinder head. Inthe case of the common single-ended pis-ton rod, the variation in steam pressure,or, rather, the duration of high steampressure, at the different ends of the pis-ton can be readily determined by cal-culating the area of the piston rod anddeducting it from t
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . re theside play to piston crosshead and lost the cut-off occurs in the back of thecylinder is of considerable importance,referring as it does in the case of a pis-ton where the piston rod does not ex-tend through the front cylinder head. Inthe case of the common single-ended pis-ton rod, the variation in steam pressure,or, rather, the duration of high steampressure, at the different ends of the pis-ton can be readily determined by cal-culating the area of the piston rod anddeducting it from the area of the , supposing the piston rod to be 5ins. in diameter and the piston 25 ins. indiameter, their ratio of area being equalto the square of their diameters, the pis-ton would occupy l-2Sth of the space oc-cupied by the piston. Hence if the pointof cut-off on the front end of the pistonstroke occurred at 6% ins., a distance of6A ins. at the back end of the stroke main rod bearings are avoided. See Draw line on tire parallel with out-side edge and find exact center between. FIG. l. motion in main rod is very likely notconsidered. Driving horn binders notbeing tightened and driving axle boxwedges being set up may be disregarded,thus allowing of an incorrect dead centreand even when dead centres are found,when in the act of catching one it maypossibly be allowed to run by slightlyand let go. The setting up of the drivingwheels which occupy the rollers to theblue print distance from main frames onboth sides during valve setting cuts somefigure with the lead and the correct settingof the eccentric crank arms or sheaves,as the case may be. Striking a mean effect on lead andvalve travels for a given change of reachrod of lifters amounts to something, butif this is neglected and again when would equalize the amount of steam ad-mitted at both ends of the stroke. Furthermore, again referring to thesecuring of the dead center marks, theapproved method of securing
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