Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 205
E and visible from L. Constructfrom E the perpendicular EA to LR. Measure LA and AE.LE can then be computed. (How ?) If intermediate pointson LE are to be sought, take any point in LA, as B; constructBC perpendicular to LA ; then measure off BD of such lengththat BD: AE = LB:LA. The line LR is… … PX E Fig. 7 by the method in 2. Range FIELD INSTRUMENTS 217 out PL in line with LP and equal to LP; similarly, PE = EP.Then measure LE. which is equal to LE. (Why?) EXERCISE I 1. Range out a line which, by estimation, is more than10 chains long. Then measure it with the chain out andback. 2.…
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