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 282
urveying is founded on the Fifth Method ofdetermining the position of a point, by measuring the angles betwenthree lines conceived to pass from the required point to threeknown points, as illustrated in Art. (10). To fix the place of the point from these data is much more diffi-cult than in the… … objects observed from S, the angles ASB and BSC being theremeasured. To fix this point, S, on the plat containing A, B andC, draw lines from A and B, making angles with AB each equal 276 TRILIXEAR SURVEYIAG. [pari vi to 90°—ASB. The intersection of these Imes at 0 will be thecentre of a circle…
Surveying
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