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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 398

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 398
x quadri-lateral ; EAFC, a uni-eoncave quadrilateral;and EBAFD, a bi-eoncave quadrilateral, com-posed of two opposite triangles. The complete quadrilateral, AEBCDF, hasthree diagonals; viz., two interior, AC, BD;and one exterior, EF. Theorem VIII.—Li every complete quadrilateral the middle points… … 392 THE COMPLETE QUADRILATERAL. [app. b. Fig. 413.

Surveying

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