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 243
45 40 W 9 8 ? !6 5 4 3 2 I --V- r^^/\f /i- I (352) Circle dirided to 15. If 60 spaces on the Vernier are equal to 59 on the circle, each space on the Vernier will be = 59 X 15 = 14 45, and the Vernier will read to 15. In the 60 following figure the reading is 10° 20 45, the index pointing to10° 15,… … 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…
Surveying
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