. Elemente der Eisenbahnstrecke und Konstruktion . ch und B 6 ist 6J Zoll, B 6 ist 6 Zoll, und der Winkel AiB =UK B =s; und im Dreieck &A B. SM s ab = ^ = 2S («1> aus dem Tabelle XV berechnet werden kann. TABELLE XV.Schaltschienen und Winkel. Länge der Schaltschiene, S. Frosch. Nr. tatsächlicher theoretischer Schaltwinkel, s. Fuß. Fuß. 11.0 11.46 36 19 5 11.0 11.46 2 36 19 6 11.0 11.46 2 36 19 7 16.5 17.19 1 44 11 8 16.5 17.19 1 44 11 9 16.5 17.19 1 44 11 10 16.5 17.19 1 44 11 12 22.0 22.92 1 18 08 16 33.0 34.38 0 52 05 18 33.0 34.38 0 52 05 20 33.0 34.38 0 52 05 24 33.0 34.38 0 52 05 129. Die Praxie
2346 x 1066 px | 39,7 x 18,1 cm | 15,6 x 7,1 inches | 150dpi
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. Elements of railroad track and construction . ch and B 6 is 6J inches, B 6 is 6 inches, and the angleh AiB =Uk B =s; and in the triangle &A B. sm s AB = ^ = 2S («1> from which Table XV may be computed. TABLE XV.Switch-rails and Angles. Length of Switch-rail, S. Frog. No. Actual Theoretical Switch Angle, s. Feet. Feet. 4 11.0 11.46 2° 36 19 5 11.0 11.46 2 36 19 6 11.0 11.46 2 36 19 7 16.5 17.19 1 44 11 8 16.5 17.19 1 44 11 9 16.5 17.19 1 44 11 10 16.5 17.19 1 44 11 12 22.0 22.92 1 18 08 16 33.0 34.38 0 52 05 18 33.0 34.38 0 52 05 20 33.0 34.38 0 52 05 24 33.0 34.38 0 52 05 129. The Practical Turnout.—^The practical turn-out from a straight track is shown in Fig. 78, the fourprincipal lines representing the gauge-lines of the PRACTICAL TURNOUTS. 133 rails. The longer turnout rail consists of the circularlead-curve, B C, the straight switch-point rail, A B, and the straight frog-wing, C P, both being tangentto the lead-curve. In addition to the definitions in 1fl08, Fig. 66, letthe following symbols be assumed: AiA c H N M. rl^i / ^^^^^-^-_—-—. yj 1, // / C^^M 11* / ^~^-^^^^^s^:5r:rr =^ w Fig. 78a. ^ i Fig. 78. S =the theoretical length of switch-rail;S =the actual length of switch-rail;s = switch-rail angle =c 0 B =H Ai B, Fig. 78, or deB, Fig. 78a. k =length of toe wing-rail of frog =P C =P C, Fig. 78. In Fig. 78, Ai is the theoretical point of switch-rail, B is the heel of switch-rail, C is the toe of frog, and P is the theoretical point of frog. In the triangle HAiB. smHAiB = -r—f, , orAlt) sm s = S (62)^ 134 RAILROAD TRACK AND CONSTRUCTION. Since the A. R. E. A. recommends that the thick-ness of the point be ^ inch, then taking h and S infeet, we have h - 0.021 , „_, -sm s = g (620 130. To Find the Long Chord B C—In Fig. 78, continue the tangents Ai B and C P until they meetat I, draw the hne 0 I, and P M normal to the maintrack, and project B to K and C to L, then the angleKBC=IBC + KBI=i(F-s) + s=i(F + s), and theangle E I C =B 0 C =F -s. Then in t
