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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 168

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 168
t for this. They are then transferred to the places wherethey are wanted, by a triangle or other parallel ruler, as explainedon page 27. The figure at the top of the next page representsthe same field platted by this method. A semi-circular protractor is sometimes attached to the stockend of the T… … S 0 (267) The Compass itself may be used to plat bearings. Forthis purpose it must be attached to a square board so that the Nand S Hne of the compass box may be parallel to two oppositeedgesof the board. This is placed on the paper, and the box isturned till the needle points as it did when the…

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