Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn · leaf 17
m 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 called a random T e line. 4. To… … E FIELD INSTRUMENTS 9 out PL in line with LP and equal to L,P; similarly, RE = ER.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. Prolong a line beyond a building, or other…
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