International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 321
e 910 RAILROAD CONSTRUCTION. direction to j, making ^/j = a b = 2 ft. Join,r- andj. Findthe middle points x and j/ of the upper and lower bases ofthe section. Join these points. The intersection g of thelines X y and x y is the center of gravity of the trapezoida b d c. The volume of the section of… … = 154lb. )=the weight of the section a b d c. Drawthrough ^ a vertical line ^i^/, and lay off in it to a scale of2,000 lb. to the inch from the point /, where the line ofgravity intersects the prolongation of the line of pressure]i 1\ the length / t equal to 4,504 lb., the weight of the wall.Lay…
Railroad engineering
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