Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 64
the point, at which theline AD cuts the staff BE, be marked. Measure the distanceBE on the staff; then, AB : BE :: AC: CD, whence CD becomes known. If the line ^(7 cannot be measured, on account of interveningobjects, it may be determined by calculation, as in the precedingarticle, and then, having… … Fig. 44. 58 ELEMENTS OF SURVETIXG. [BOOK IL a standard kept for the purpose. A convenient standard forsuch comparison may be made by driving into a level and evenpiece of ground two stakes, sawed off even with the surface ofthe ground, distant from each other one chain, or CG feet,accurately…
Surveying
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