International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 431
sq. ft. Contents of the included prismoid = 175.8 x 50 = 8,790cu. ft. = 325.6 cu. yd. In apulying the prismoidal formula we calculate the areaof a section midway between the given sections, and for itsdimensions we take the mean of the dimensions of the givensections. These dimensions will be as… … FlG. 486. The area of section Jl/ is computed l)y the same methodas that used with sections A and B in Figs. 484 and 485,and is as follows: RAILROAD CONSTRUCTION. 1021 Area of triangles a + b = lL^±Ji^ X 9 = 60.6 sq. ft. Area of triangles c+d ,^^^!:1+1M^ x 6.5 = 106.0 «q. ft.Total area of section…
Railroad engineering
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