. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . (r-ig) = vers F (107)FR=(r- Fig. 146. ■ig) sini^. (108) If it is considered that the distance FR con^mes too muchtrack room it may be shortened by the method indicated inFig. 151. 272. Connecting curve from a curved track to the the main track is curved, the required quantities are the. Fig. 147. radius r of the connecting curve from F to S, Fig. 147, and itslength or central angle. In the triangle CSF CS + i(CFS-^CSF):tsin i(CFS -CSF); § 273. SWITC

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. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . (r-ig) = vers F (107)FR=(r- Fig. 146. ■ig) sini^. (108) If it is considered that the distance FR con^mes too muchtrack room it may be shortened by the method indicated inFig. 151. 272. Connecting curve from a curved track to the the main track is curved, the required quantities are the. Fig. 147. radius r of the connecting curve from F to S, Fig. 147, and itslength or central angle. In the triangle CSF CS + i(CFS-^CSF):tsin i(CFS -CSF); § 273. SWITCHES AND CROSSINGS. 309 but i(CFS-^CSF) =90-i(p; and, since the triangle O^SF isisosceles, i(CFS-CSF)=hF; .-. 2R-\-d:d-g::coti(p:tsiniF::cot JF:tan i<(f; ■■■ W-i^ <™ From the triangle CO^F we may derive r — hg:R-i-ig::sin (/f• sin (F-h(p); ^-*^ = (^-^i^)swf?) ^^ Also FS = 2(r-ig)smi(F-^(/;) (Ill) 273. Connecting curve from a curved track to the INSIDE,

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