A treatise on levelling, topography, and higher surveying (1876)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, b. 1840, ed · New York, D. Appleton and company · leaf 154
Fig. 168. … A, B, and C, draw lines from A and B, making angles withAB, each equal to 90°— A SB. The intersection of theselines at O will be the centre of a circle passing through A and B, in the circumference of which the point S will be situated.1 1 For, the arc A B measures the angle AOBat the centre, which…
Surveying
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