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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 166

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 166
a straight-edged ru-ler, and slide along against itthe outside of the stock of a Tsquare, one side of the stockbeing flush with the blade. A parallel ruler may also beused, one part of it beingscrewed down to the board inthe proper position. If none of these means are at hand, approximately… … (266) To plat a survey with these instruments, mark, with a finepoint enclosed in a circle, a convenient spot in the paper to repre-lent the first station, 1 in the figure. Its place must be so chosen Fig. 181.

Surveying

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