A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &c. Illustrated by four hundred engravings, and a magnetic chart (1875)
Gillespie, W. M. (William Mitchell), 1816-1868 · New York, D. Appleton · leaf 59
side may form one side of the final triangle, the base of whichwill therefore be shorter, and wUl not be cut so acutely by thefinal line drawn, as to make the point of intersection too indefinite. * Far, the triangle 1—2—3 taken away from the original figure is equivalent1 the triangle 1—1—3 added… … (81) General Huh. When the given figure has many sides^with angles sometimes salient and sometimes re-entering, the opera-tions of reduction are very liable to errors, if the draftsman attempt?to reason out each step. AU difficulties, however, will be removeuby the foUowing G-eneral Rule : 1.…
Surveying
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