International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 433
icationof material, as shown in Fig. 4K7, a final cross-section istaken and platted in lines of a separate color. The different colored lines at once indicate the outlines ofthe various materials and assist in checking the calculationsof the partial areas. The original cross-sections and the… … Fig. 487. In Fig. 487 Ave have, remembering that the slopes of f gand c h are 1 to 1: Total.Area of triangle a ^ c of solid rock = 9x2 =18.0 sq.ft. IS.Osq. ft.Area of triangle (5 ^/of loose rock = 9x1 — 9.0 sq.ft.Area of triangle ^ <Zof loose rock = 11x2.1 =~3.1 sq.ft.Area of triangle c b k of…
Railroad engineering
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