Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn · leaf 99
s known. SECTION XXIII CROSS-SECTION WORK Excavations. If the roadbed lies below the surface, anexcavation is made. Let ACBD (Pig. 58) represent a cross 89 90 SURVEYING section of an excavation, f a point in the middle surface line,/ the corresponding point in the roadbed, and CD the widthof the… … If from the area of the trapezoid ABBA the areas ofthe triangles AAC and BBD are deducted, the remainderis the area of the cross section. In like manner the crosssection at the next station may be • determined. These twocross sections, if similar, are the bases of a frustum of aquadrangular pyramid…
Surveying
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