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 271
ecimal0.00000004231 ; as shewn in Appendix B. In a Geodesic survey, the base wouldalso be required to be reduced to the level of the sea. t When two angles only are observed, as is often the case m the secondarytriargulation, the unobserved angle ought to be nearly a right angle. 264 TRIAXGULAR… … C and D are the nearest stations. In the triangles ABC and ABD,all the angles being observed and the side AB known, the otherBides can be readily calculated. Then in each of the trianglesDAC and DBC, two sides and the contained angles are given to findDC, one calculation checking the other. DC then…
Surveying
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