A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 397
difference of theseangles will be nearly equal to the desired angle. 2. Note, if possible, some point above or below one of the ob-jects, and on the same level Avith the other, and observe to it andthe other object. 3. Suspend two plumb lines, and place the eye so that theselines cover the two… … H A With these data the oblique angle can be reduced to its horizontalprojection, either by descriptive geometry or more precisely by cal-culation, thus: Let x\ II B, Fig. 552, be the observed angle, and K II B the re-quired horizontal angle. Conceive a vertical 11 Z, and a spherical surface, of…
Surveying
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