. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . Fig. 149. sin (/fsin{<p--F) (116). Fig. 150. Problem. To find tlie dimensions of a connecting curve run-ning to the inside of a curved main track; number 9 frog, 4° 30curve, d==13, g=A 8J. § 274. SWITCHES AND CROSSINGS. 311 Solution, Eq. 112. (± B = ~2« = = (2jB--d) = d= (7= -g)= Eq. 116. (R-^g) = (♦-2?) = 1373. log = log sin (*-F) = Eq. 114. ^(*-i?) = .. sin

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. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . Fig. 149. sin (/fsin{<p--F) (116). Fig. 150. Problem. To find tlie dimensions of a connecting curve run-ning to the inside of a curved main track; number 9 frog, 4° 30curve, d==13, g=A 8J. § 274. SWITCHES AND CROSSINGS. 311 Solution, Eq. 112. (± B = ~2« = = (2jB--d) = d= (7= -g)= Eq. 116. (R-^g) = (♦-2?) = 1373. log = log sin (*-F) = Eq. 114. ^(*-i?) = .. sin K*-F) = log 2n = log (d-g) = co-log (2R-d) = log tan i^ = (^-F) = = .91866=° 22 14go 44/ 28/ 6° 21^ 35^^0° 22 53 iog(i2-^a) = log sin * = co-log sin (*-F)-2JT676 (r + ^^) = . r = rf = 0° ly (r + ifi^) = sini( F>S= 274. Crossover between §! V ^ 3^^. — 1\ re\ Q /j 1 \ \ ^11 r \ / Y \ 1. —d— i ^ K ° Oj FiQ. 151. two parallel straight tracks. (SeeFig. 151.) The turnoutsare as usual. The cross-over track

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