International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 61
and Chord Deflections.—Let it be remembered fora basis of calculation that the chord deflection for a one-degree curve, the chord being 100 feet in length, is 1.745feet; for a 2° curve, double the deflection for a 1° curve, or3.49 feet, and so on. The tangent deflection being one-halfthe chord… … Fig. 284. is assumed as 1. Thus, the tangent deflection for 75 feetwill be expressed as the tangent deflection for .75 of astation. This expression is, however, confined entirely to SURVEYING. G51 the calculation, and is spoken ofdiS the tangent deflection for75 feet. Fig. 284 will be used to…
Railroad engineering
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