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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 244

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 244
15 10 I I III W 9 8 7 6: 5 4 3 2 1 /|\ f CHAH. II.] Verniers. 237 (353) Circle divided to 10. If 60 spaces on the Vernier beequal to 59 on the limb, the Vernier will read to 10. In thefollowing figure, the reading is 7° 25 40, the reading on thecircle being 7° 20, and the Vernier showing the… … 10 9 8 7 6 5 4 3 2 1 y^S \ C354) Readmi? backwards. AVhen an index carrying a Ver-nier is moved backwards, or in a contrary direction to that inwhich the numbers on the circle run, if we wish to read the spa^ewhich it has passed over in this du-ection from the zero point, theVernier must be read…

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