Surveying ; a manual of practical instruction in the art of plane surveying, including plotting, leveling, triangulation, line running, cross-sectioning, traversing, and other details of field work (1910)
American School of Correspondence, Phillips, Alfred Edward, 1863- [from old catalog] · Chicago, American school of correspondence · leaf 31
20 PLANE SUKVEYING To find this area, at points aloncr ED, erect perpendiculars tothe irregular shore line at such distances that the lines 1 2, 2 3etc., may be considered straight. The desired area will evidentlyequal the sum of the areas of the trapezoid? ttii3 formed. Thedistance from E to any… … Fijr. 16. Instead of summing the trapezoid as above, the desired areamay be found by the following rule: Multiply the differenceiietween each ordinate and the second succeeding one by theal)scissa of the intervening ordinate. Multiply also the sum of thelast two ordinates by the last abscissa;…
Surveying
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