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 494
ing at A directly, and B by reflection,till you come to some point, C, at which they coincide. Then isCA= AB. 710. To measure a Line when Both Ends are inaccessible. Let AB be the required line. At any point, C, measure the angleA C B. Set the sextant to half that angle, and walk back in theline B… … 711. All the methods for overcoming obstacles to measurement,determining inaccessible distances, etc. (Part I, Chapter V), withthe transit or theodolite, can be executed with the sextant. 712. To measure Heights. Measure the vertical angle betweenthe top of the object and a mark at the height of…
Surveying
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