. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools . 276a. SWITCHES AND CROSSINGS. 321. FiQ. 156a.—Single and Double Slips. 322 KAILROAD CONSTRUCTION. § 279. Structurally the very strongly constructed, and the angles should preferably be90° or as near that as possible. The frogs will not in generalbe ^stock frogs of an even number, especially if the angles arelarge, but must be made to order with the required angles asmeasured. In Fig. 157 are shown the details of such a the fillers, bolts, and guard-rails. 278. One
. Railroad construction. Theory and practice. A textbook for the use of students in colleges and technical schools . 276a. SWITCHES AND CROSSINGS. 321. FiQ. 156a.—Single and Double Slips. 322 KAILROAD CONSTRUCTION. § 279. Structurally the very strongly constructed, and the angles should preferably be90° or as near that as possible. The frogs will not in generalbe ^stock frogs of an even number, especially if the angles arelarge, but must be made to order with the required angles asmeasured. In Fig. 157 are shown the details of such a the fillers, bolts, and guard-rails. 278. One straight and one curved track,crossing is about the same as above,but the frog angles are all Fig. 158, R is known, and theangle ikT, made by the center linesof the tracks at their point of inter-section, is also known. M=NCM, NC=R cos M, (R-ig) cos F,=NC + ig; R cos M + ig ,\ cosFi =Similarly cos F2 = cos Fo = cos F^ = R-ig R cos M + jg R + ig RcosM—jg R+hg R cos M — ^gR-ig . (129)
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