A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 392
seen to coincide when at some point, D. Then A D = ^ A B. Ifthe index be set at 71° 34, then the measured distance will be ^ A B,and so on. If the index be set at the complements of the above angles, the TO MEASURE A LINE, ONE END INACCESSIBLE, 381 distance measured will be, in the first case,… … D as before. Set the index at 26° 34, and go along the line to E,where the objects are seen to coincide with each other; then is A Etwice A B, and hence E D = A B. Fig. 546. B
Surveying
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