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 111
Fig. 127. 158. To an Inaccessible Line. The shortest distance, C D, froma given point, C, to an inaccessiblestraight line A B, is required. FromC let fall a perpendicular to A B, bythe method of Art 119. Then set astake at any point, E, on the line A C ;set a second, F, at the intersection ofE B… … Measure C H and H F.CH + HF Then is C D = CH-HF or CD = CH. CH-HF or CD = CHX CF 2CH-CF OBSTACLES TO MEASUREMENT IN CHAIN-SURVEYING. 97 When two lines (as A B, Fig. 128.
Surveying
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