A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 96
119. First Method. Fig. 95. … Let P be the given point, and AB thegiven line. By the preceding prob-lem let fall perpendiculars from A toB P at C ; and from B to A P at D ;the line P E, passing from the givenpoint to the intersection of theseperpendiculars, is the desired perpen-dicular to the inaccessible line A B.This method…
Surveying
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