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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 241

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 241
The above figure shows tliis arrangement. The reading is 0°,or 360°. In the followino; fiorure, the dotted and crossed line shows whatdivisions coincide, and the reading is 20° 10; the Vernier beingthe same as in the preceding figure, and its zero being at a pointof the circle 10 beyond 20\ 234… … In the following figure, the reading is 20° 40, the index beingat a point beyond 20° 30, and the additional space being shownby the Vernier to be 10. Fig. 232.

Surveying

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