International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 544
ig. 541. Case II.—When the two curves deflect in the same direc-tion, illustrated in Fig. 542. In Fig. 541, the curve a b \?, 3° 30, and it is proposed touse a No. 8 frog. By reference to Table 35, we find thatthe degree of curvecorresponding to a No.8 frog is 9° 31. Ac-cordingly, we use aturnout… … 1132 TRACK WORK. degree, and close enough for practical purposes. From ourknowledge of tangent and chord deflections we know thatfor curves of moderate radii, i. e., from 1° up to 12°, thetangent deflections or ofi:sets increase as the degree of thecurve. That is, the tangent deflection of a 2, 4°,…
Railroad engineering
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