Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 63
56 ELEMEISTS OF SURVEYIH^G. [book II. … Fig. 42. the ends of the chain at A and the point so determined, and pullout the middle, thus forming an equilateral triangle. If there isnot room to measure towards C, measure back towards 0, andconstruct the angle on the side of A 0 away from B. The errorsare cumulative in this method, but it is…
Surveying
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