International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 44
ion of the Hne C D. A good form of notesfor such a survey is that given above. 1242. Checking Angles by the Needle.—In spite ofthe greatest care, errors in the reading and recording ofangles will occur. The best check to such errors is themagnetic needle. And though it is not an exact check,owing… … Fig. 269. C34 SURVEYING. in checking angles. The bearing of the line A B, whichcorresponds to A B in Fig. 208, is N To OO E, and isassumed to be correct. The bearing of the line /) C, as readfrom the needle, is N. 8!)° 20 E. Its deduced or calcu-lated bearing is obtained as follows: To the bearing…
Railroad engineering
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