. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . alve has to be increased in the case ofthe forward motion, and diminished in theback niulion. -\ow assuming that thecliange is to be made on the left side ofthe engine and that the main rod is onthe forward dead center as in Fig. i, itwill be readily observed that in order toincrease the opening of the valve it mustbe moved backw-ards toward the accomplish tliis movement the eccentricrod must be shortened, and if it were con-venient to remove the pin connecting theforward end of the e
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . alve has to be increased in the case ofthe forward motion, and diminished in theback niulion. -\ow assuming that thecliange is to be made on the left side ofthe engine and that the main rod is onthe forward dead center as in Fig. i, itwill be readily observed that in order toincrease the opening of the valve it mustbe moved backw-ards toward the accomplish tliis movement the eccentricrod must be shortened, and if it were con-venient to remove the pin connecting theforward end of the eccentric rod from thelink arm, allowing the rod to remain inposition, and moving the valve the re-quired distance it would be seen by thevariation in the edges of the hole in thelink arm from that of the eccentric rodhow much the eccentric rod would requireto be shortened. This method, however, isnot entirely to be depended upon, as thereis a certain amount of lost motion bothin the valve and radius rod connections,as well as on the central pivot upon whichthe link is suspended. These, in addition. FIG. I. FOR\V.\RD (;i;.\R, LIXKBLOCK .\T liOTTOM OF LINK. reverse lever is at the extreme end of thequadrant in the forward motion, it willbe readily seen whether the valve rod isof the proper length, as soon as the twovalve rod markings are made when themain rod has reached the dead variation there may be canreadily be rectified by dividing the ap- to tlie link block would admit of a slightmotion backward or forward of the ex-treme point of the link arm without show-ing any motion of the valve. Generallyspeaking the eccentric will require to bemoved or shortened as in the present casebetween two and three times more thanthe amount required in the opening of the valve. The ratio can be deter-mined by measuring the distance fromtlie central stud upon which the link oscil-lates to the center of the link block, andsupposing this distance to be 8 ins., thenmeasuri
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