International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 60
t and Chord Deflections.—Let A B in Fig. 283 be a tangent, and j5 C E H ?i curve commencingat B. Produce the tangent A B to the point D. The lineC D IS di tangent deflection, and is the perpendiculardistance from the tangent to the curve. If the chord B Cbe produced to the point 6, making C G =^ B… … ^ Fig. 283. The triangles O C E and C E G are similar, since bothare isosceles, and the angle G C E— angle C O E. Hence, ()50 SURVEYING. we have O C : C EwC E \ E G. Denoting the chord C Eby c and the chord deflection E G by c/, we have, from theabove proportion, R : ciw : d. Therefore, d: [92, To…
Railroad engineering
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