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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 418

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 418
Fig. 420, … »nd B. If C be 1 foot below B, as in the figure, it will be 5 feet below A It itwere found to be 7 feet above B, it would be 3 feet above A. The comparativeheight of a series of any number of points, can thus be found in reference to anyone of them. The beginner in the practice of levelling may…

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