. Railroad structures and estimates . GI? SECTIONAL ELEVATION Tron H»r Ira!I. Fig. 28. Arsenal St. Bridge at St. Louis. 120 STEEL BRIDGES. The floor of roadway is finished with 3| in. wood blocks on a^ in. bed of sand supported on the concrete base. The sidewalkis of 3| in. concrete reinforced with f in. round bars; the fiUedportion under the sidewalk slab is composed of cinders. ^3H Wood Elects[Concrete ncK typical arrangement ofBearing and reinforcement a Mortal- Bed ._36i Q Tli^x ISDo-reelB ^i ^- ^fo e. jy^Bare 3}^Concrete,

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