International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 430
section given in Fig. 484 iscomposed of the four triangles a, b, c, and d. The triangles RAILROAD CONSTRUCTION. 1019 a and /; have equal bases of !) feet, the half width of theroadway; hence, if we take half the sum of their altitudesand multiply it by the common base we shall have the sumof the… … Fig. 484. -v^ 18.7- * ^:\:^ c ^ ~ 11.2— A \^ a ^ \ is Z-^^\ v= 9 J 9 -J Fig. 485, the areas of the triangles c and (/. Taking the dimensionsof section A given in Fig. 484, we have Area of triangles a -^ ^? = —~^— X 9 = 80.1 sq. ft. 31 8 111Area of triangles r + ^/ = —-—^— X 8 = 143.2 sq. ft. Total…
Railroad engineering
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