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Latitudinal and longitudinal I-beams supported by the bottom chords provide a deck frame. They are trussed with two 7 ⁄ 8-inch wrought iron rods and braced by tie rods. Wooden planks laid horizontally across the frame serve as the deck. [2] Modern box girder guardrails run along both sides.
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The Wrought Iron Bridge Company specialized in relatively short-span iron truss bridges. Most were built for highway use, as the railroads were all privately owned at the time and employed their own engineers. The company supplied a catalog of bridge designs and mass-produced the parts to build these designs.
Caledonia Bowstring Bridge; Caledonia Bridge (Caledonia, North Dakota) Capon Lake Whipple Truss Bridge; Chain Bridge at Falls of Schuylkill; Chain Lakes Bridge; Cheboygan Bascule Bridge; County Line Bowstring; Cunningham Bridge; Cuyahoga River Bridge 1
Wrought iron is an iron alloy with a very low carbon content (less than 0.05%) in contrast to that of cast iron (2.1% to 4.5%). It is a semi-fused mass of iron with fibrous slag inclusions (up to 2% by weight), which give it a wood-like "grain" that is visible when it is etched, rusted, or bent to failure.
The truss structure is a mixture of wrought and cast iron. The truss configuration is the design patented by Bollman as the "Bollman suspension truss" in 1852. Each span is 79.5 feet (24.2 m) long, 25.5 feet (7.8 m) wide and about 21 feet (6.4 m) tall.
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