. The railroad and engineering journal . S t s iFig. 224 of the valve in relation to the port c in the same way as it isshown in fig. 21S. It has already been , that the movement of theedges &I and M of the valve, and the two sets of curves in , are alike. They differ from each other only in theirrelation to the ports c and J. The steam-edge, M, it will beseen, is iV of an inch—equal to the lead—from the line Ms orthe edge of the port r, whereas the e.\haust-cdge .1/ is i m t, the inner edge of the port </. If, then, in fig. 224, wedraw a line m (, I in. fr
. The railroad and engineering journal . S t s iFig. 224 of the valve in relation to the port c in the same way as it isshown in fig. 21S. It has already been , that the movement of theedges &I and M of the valve, and the two sets of curves in , are alike. They differ from each other only in theirrelation to the ports c and J. The steam-edge, M, it will beseen, is iV of an inch—equal to the lead—from the line Ms orthe edge of the port r, whereas the e.\haust-cdge .1/ is i m t, the inner edge of the port </. If, then, in fig. 224, wedraw a line m (, I in. from M, and another, /; /, at a distancefrom m t equal to the width of the port d, fig. 21S, and parallel. Fig. 225. fore drawn below the horizontal line L s to represent the steam-edge L. fig. 218, of the valve. In fig. 225 the line L has beenlaid down in the same position as in fig. 223, but the line AZhas been drawn -i\- of an inch from /., to represent the lead ofthe valve, and another line, k /, is drawn parallel to it at a dis-tance equal to the width of the port d, fig. 21S. If this is donethe relation of the curves 5 T M, and s t M in fig. 225, will rep-resent the movement of the steam-edge L\ fig. 2i8, of the valvein relation to the port d, just as the movement of M is shown infig. 224. To show the motion of the exhaust-edge L in relation to the Vol. LXII, No. 8.] ENGINEERING JOURNAL. 367 port f, fig. 21S, a line, // B, is drawn in fig. 225 i in. from Z.,or in the same relative posilion to L that m t occupies to Min fig. 21S. Another doited line, a b, is drawn in fig. 225 at adistance from A B equal to the width of the port c. The relationof the curves 5 J M and s / A/ to these do
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Keywords: ., bookcentury1800, bookdecade1880, bookidrailroadengi, bookyear1887
