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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 133

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 133
O (^^3^ … CHAPTER 11. THE COMPASS. (221) Til* Needle. The most essential part of the compass iathe magnetic needle. It is a slender bar of steel, usually five orBix inches long, strongly magnetized, and balanced on a pivot, scthat it may turn freely, and thus be enabled to continue pointingin the same…

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