. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools . Fig. 144. by separate applications of Eq. 102 or 103, the radius beingdetermined by Eq. 104. 270. Two turnouts on the same side. In Fig. 145, let 0^bisect O2D, Then (n + J^) = J(^2 + iS); also, Ofi^^O^Fi smdFr^Fi. _ ^9 . YeTsFm = -r (105) BFm=(T-\-\g)miF^ (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. apparent when it is considered that the middle switch may beregarded simply as a curved main tra

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. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools . Fig. 144. by separate applications of Eq. 102 or 103, the radius beingdetermined by Eq. 104. 270. Two turnouts on the same side. In Fig. 145, let 0^bisect O2D, Then (n + J^) = J(^2 + iS); also, Ofi^^O^Fi smdFr^Fi. _ ^9 . YeTsFm = -r (105) BFm=(T-\-\g)miF^ (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. apparent when it is considered that the middle switch may beregarded simply as a curved main track, and that, as developed 308 RAILROAD CONSTRUCTION. §271. 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 andthe 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 r the radius of the con-necting curve. Then

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