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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 298

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to-be deter- ^rr -2^ mined, having one end accessible.Determine them, as in Art. (427),by choosing a point D, from whichC and A are visble, and a point Efrom which C and B are visible.At C observe the angles DCA,ACBand BCE. Measure the distances CD and CE. Observe theangles ADC and BEC. Then in the… … 292 OBSTACLES IIV ANGULAR SIRVEIING. [part vii

Surveying

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