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 98
h of an acre ;or about one-fortieth of one per cent, on the total area. (131) The six lines. In most cases, great or small, six fuudamental lines will need to be measiired; viz. four approximateboundary lines, forming a quadrilateral, and its two diagonals.Small triangles, to determine prominent… … Thus, in the above figure, two straight lines AB and CD aremeasured through the entire length and breadth of the farm, ortownship, which is to be surveyed. The connecting lines AC, OB,BD and DA are also measured, uniting the extremities of thefiist two lines. The last four lines thus form a…
Surveying
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