Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn · leaf 16
r other object,stands in the way. In Pig. 4 construct theperpendicular AB, the per- -^—pendicular BC, the perpen-dicular CD = AB, then theperpendicular DE, which fig. 4 will be in line LA prolonged. Then, LA + BC + DE = LE. (Why ?) As a check, anotherseries of perpendiculars may be constructed. 2.… … 8 SURVEYING The line AC is equal to AP. (Why ?) If C is some fixedpoint in LE, across the stream, accessible or inaccessible, wemay proceed as follows: After laying out AP, as alreadydescribed, with 90 links of the chain stretched in the formof an equilateral triangle, and with one side of this…
Surveying
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