tmr*who published a book on *• d™s° °f ^ Prior to 1850 few iron bridges were erected. The first metal bridgeswere of cast or wrought iron, and it was not until about 1S70 that thesematerials were replaced by steel. Probably the first reinforced concretebridge in this country was erected at San… … SMALL CONCRETE BRIDGES AND CULVERTS Culverts and bridges stand in intimate relation to the improvementof the public highways, but the economy of building these structures ofdurable and permanent materials and according to intelligent,urpose of economic design, has not generally been recognized.…
Bridges · Concrete · Culverts
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