A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 119
letters indicatingtwo points are joined together,the point half-way between thetwo meant; thus, 2s. E. ishalf-way between north and east; and X. X. E. is half-way be-tween north and northeast. 2. When the letters of two pointsare joined together with the intermediate word by, it indicatesthe point… … 172. Eccentricity. The center-pin, or pivot of the needle,ought to be exactly in the center of the graduated circle; theneedle ought to be straight, and the line of the sights ought topass exactly through this center and through the 0 points of thecircle. If this is not the case, there will be an…
Surveying
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