International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 45
reading thevernier. It is a wise precaution to read both angle andbearing after they are recorded and compare them with therecorded readings. B TRIANGULATION.1243. Simple Triangulation.—Triangulation is an application of the principles of trigonometry to the measurement of in-accessible lines… … Fig. 270. SURVEYING. G35 each side of the stream. Estimate roughly the distanceA B. Suppose the estimate is 425 feet. Set another pointC, making the distance A C equal to the estimated dis-tance A B — -425 feet. Set the transit at A and measurethe angle B A C = say 79° 00. Next set up at the pointC…
Railroad engineering
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