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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 130

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 130
ermed graduations.The figure shows only every fifteenthone. In the centre of the circle,fix a needle, or sharp-pointed wire, and upon this fix a straightstick, or thin ruler placed edge-wise, (called an alidade), so thatit may turn freely on this point and nearly touch the graduationsof the circle.…

Surveying

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