A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart (1875)
Gillespie, W. M. (William Mitchell), 1816-1868 · New York, D. Appleton · leaf 298
(431) Probiem. To measure an inaccessible distance, AB,when a point, C, in its line can be obtained. Set the instrumentat a point, D, from which A, Band C can be seen, and measurethe andes CDA and ADB.Measure also the Une DC andthe angle C. Then in the tri-angle ACD two angles and theincluded side… … (432) Problem. To measure an inaccessible distance, AB,when only one point, C, can be found from which both ends of theline can be seen. Consider CA Fi. 29.5. and CB as distances to-be deter- ^rr -2^ mined, having one end accessible.Determine them, as in Art. (427),by choosing a point D, from…
Surveying
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