. Concrete bridges and culverts, for both railroads and highways . (704 2 Portals;— Concrete £8 yes. (u ) Barrel per ft. Concrete yds. (Ti $ Steel 460 lbs. (n, .04= *76 4 Length for 20 ft. bank = 32 ft. Area = 215 sq. It. Cost 2 Portals:—Concrete (&t8,0)= 2670 lbs. @ .04= 00 = $ .04= $ AreB = 128 sq. ft. Length for 120 ft. bank = 39 ft. Cost for 20 ft. , $1844. Fig. .-.( CONCRETE CULVERTS AND TRESTLES. 227 R is the hpi<z-lit in feet, and D the crown thicknessin inches.

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