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 252
is formed farther from the objective,and the objective-slide must be moved out in order that the imagemay be formed at the cross-hairs. Hence, we see that the quantityc is not rigidly con- Fig ^ stant. The differ- kl /iE ence in value, how-ever, is not enoughto be taken intoconsideration. Amean… … 238 LAND-SUB VEYINO. 347. Formula [4] is for level ground. For sloping ground, thismust be modified. In Fig. 250 let A be the center of the telescope-axis ; C E, the reading on the rod ; D, the point on the rod wherethe center cross-hair intersects the rod; A B, the horizontal dis-tance ; H, a…
Surveying
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