. Railroad construction. Theory and practice . Fig. 144. by separate applications of Eq. 112 or 103, the radius beingdetermined by Eq. 104. 270. Two turnouts on the same side. In Fig. 145, let 0^bisect O2D, Then (n + ig) =i(r2 + hg); also, Ofi^-O^Fi and Fr=Fl. vers Fm = 2g , 1 - , 1 , .... (105) r + ig r + ig BFm=(r + ig) sin Fm (106) It may readily be shown that the relative values of Fr, Fi, andFm are almost identical with those given in § 269; as may be ^. Fig. 145. apparent when it is considered that the middle switch may beregarded simply as a curved main track, and that, as developed I §
. Railroad construction. Theory and practice . Fig. 144. by separate applications of Eq. 112 or 103, the radius beingdetermined by Eq. 104. 270. Two turnouts on the same side. In Fig. 145, let 0^bisect O2D, Then (n + ig) =i(r2 + hg); also, Ofi^-O^Fi and Fr=Fl. vers Fm = 2g , 1 - , 1 , .... (105) r + ig r + ig BFm=(r + ig) sin Fm (106) It may readily be shown that the relative values of Fr, Fi, andFm are almost identical with those given in § 269; as may be ^. Fig. 145. apparent when it is considered that the middle switch may beregarded simply as a curved main track, and that, as developed I §271. SWITCHES AND CROSSINGS. 283 in § 267, the dimensions of turnouts are nearly the same whetherthe main track is straight or slightly curved. 271. Connecting curve from a straight track. The con-necting curve is the tracklying between the frog and q ^the side track where it be-comes parallel to the maintrack (FS in Fig. 146 or 147).Call d the distance betweentrack centers. The angleFO,R=F (see Fig. 146).Call / the radius of the con-necting curve. Then
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