. The railroad and engineering journal . I232227 a* If 18 — 1 17 7 10 8 15 9 W 10 ir 11 12 li 11 13 10 U 0 s IG 2i 24 Fig. 226. It will be seen that in a diagram like fig. 226 the relativeposition of the ports c and t/ is reversed from that in whichthey actually are, as shown in fig. 21S. If desirable, the inneredges of the exhaust-port ^ could also be laid down on the dia-gram, so that the motion of the valve with reference to themwould be shown. If the reader will cut a paper section of a valve, like thatshown in fig. 51, and place the different edges, a,/, and i, sothat they will succes
. The railroad and engineering journal . I232227 a* If 18 — 1 17 7 10 8 15 9 W 10 ir 11 12 li 11 13 10 U 0 s IG 2i 24 Fig. 226. It will be seen that in a diagram like fig. 226 the relativeposition of the ports c and t/ is reversed from that in whichthey actually are, as shown in fig. 21S. If desirable, the inneredges of the exhaust-port ^ could also be laid down on the dia-gram, so that the motion of the valve with reference to themwould be shown. If the reader will cut a paper section of a valve, like thatshown in fig. 51, and place the different edges, a,/, and i, sothat they will successively correspond with the line .J/in fig. 226,the diagram will, perhaps, be moie clear. If, for example, thepaper section be placed to the right of Ihe line J/, so that itsedge a will correspond with .1/, then it will be seen that theport <r occupies the same relation to it that it does in fig. the valve be placed so that the edge i corresponds with 37, L- aK Am M h a. Fig. of the sleam. If, for example, we want to observe howthe admission of sleam is governed by the valve, by referringto fig. 226 we see that at the beginning of ihe backward strokethe valve has -i\- in. lead ; that at 2i in. of the stroke ihe port cis wide open, as shown by the intersection of the motion-curvewith the line a b a.\. x ; ihat the valve has received its maximumbackward travel at y in. of the stroke, and begins to close theport at i6i^ in., and completely closes it at i\\ in. of the referring the motion-curve to the lines A /, and k I, we seethat Ihe valve as shown, /., again has -/„ in. lead at ihe begin-ning of the forward stroke ; that the steam-port is wide open at1} in. of the stroke ; begins to close at lOi in., and is com-pletely closed at 21A in. By referring the curve to the lines;« t and h i, we see that the front port begins to open to the ex- 368 •THE RAILROAD AND [August, i888. haust before the piston has completed its loiwam stro
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Keywords: ., bookcentury1800, bookdecade1880, bookidrailroadengi, bookyear1887
