. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . Fig. 148. Two other cases are possible, {a) r may increase until it becomes infinite (see Fig. 149), thenF ziz tp. In such a case we maywrite, by substituting in Eq. 112,. <2R-d^^n\d-g), (115) Fig. 149. This equation shows the value ofi?, which renders this case possiblewith the given values of n^ c/, andg. (b) ip may be greater than before (see Fig. 150) 2^ — <i : 6? — ^ :: cot -J^ : tan Ji^; 2n{cl - g) § 274. SWITCHES AND CROSSINGS. the same a

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. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools. By Walter Loring Webb . Fig. 148. Two other cases are possible, {a) r may increase until it becomes infinite (see Fig. 149), thenF ziz tp. In such a case we maywrite, by substituting in Eq. 112,. <2R-d^^n\d-g), (115) Fig. 149. This equation shows the value ofi?, which renders this case possiblewith the given values of n^ c/, andg. (b) ip may be greater than before (see Fig. 150) 2^ — <i : 6? — ^ :: cot -J^ : tan Ji^; 2n{cl - g) § 274. SWITCHES AND CROSSINGS. the same as Eq. 112, but rJ^ig^{R -ig) sin tp sin {ip — F) 293 . (116)

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