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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 128

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AD X AE (208) Quadrilaterals. In the case of a four-sided field, whose sides cannotbe measured^ or prolonged, but whosediagonals can be measured, the areamay be obtained thus. Measure thediagonals AC and BDj and also theportions AE, EC, into which one ofthem is divided by the other. Calcu-late the… … BE X CE 7-^^ Methods for obtaming the areas of mac- x P/> (209) Polygons. cessible fields of more than four sides, have been given in Arts. OOl,) &c. nr. r-. -^- . — ,-1 - - FAUT LIT. COMPASS SURVEYING; OR By the Third 3Iethod. CHAPTER I. A^G^LAR SURVEYDG L\ GENERAL. (210) Angular Surveying…

Surveying

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