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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 141

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 141
134 iOMPASS SURVEYING. [fart hi Fi^. 153. Fig. 159. Fig. 160 … terminates tlie covered spindle which enters a corresponding cavityunder the compass plate, and the socket in which this ball turns.It admits of motion in any direction, and can be tightened or loos-ened by turning the upper half of the hollow piece enclosing it,which is screwed on the lower half.…

Surveying

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