International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 54
Fig. 281. form an angle of 2° at the center O, and the curve B D iscalled a 2° curve. A curve whose radius is nearly one-thirdA i), or l,i»10.08 feet, is a 3° curve, etc. The degree of a curve is determined by the centralangle, which is subtended by a chord of 100 feet. Thus, ifBOG (Fig. 282) is… … The deflection angle of a curve is the angle formed atany point of the curve between a tangent and a chord of 100feet. The deflection angle is, therefore, half the degree (;4-t SURVEYING. of the curve. Thus, if the chord B G is lOU feet, the angleE B G is the deflection angle of the curve B G HK C,…
Railroad engineering
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