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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 75

An illustration from 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, leaf 75
ual to theirlength, forming two new triangles, as shown bythe dotted fines, and measure the sides BD,and AD. The three sides of each of thesetriangles will thus be known, and also the three sides of the triangle BAD,andBD = BD. since AD = AD, The method of this article may be employedfor a figure… … CHAPTER III. SURVEYING BY PERPENDICULARS Bi/ the Second Method. (l«?3) The method of Surveying hy Perpendiculars is foundedou the Second Method of determining the position of a point,explained in Art. (6). It is apphed in two ways, either tomaking a complete Survey by Diagonals and…

Surveying

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