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The rail profile is the cross sectional shape of a railway rail, perpendicular to its length. Early rails were made of wood, cast iron or wrought iron. All modern rails are hot rolled steel with a cross section approximate to an I-beam, but asymmetric about a horizontal axis (however see grooved rail below). The head is profiled to resist wear ...
The rod, perch, or pole (sometimes also lug) is a surveyor's tool [1] and unit of length of various historical definitions. In British imperial and US customary units, it is defined as 16 + 1 ⁄ 2 feet, equal to exactly 1 ⁄ 320 of a mile, or 5 + 1 ⁄ 2 yards (a quarter of a surveyor's chain), and is exactly 5.0292 meters.
In 1849, the method of producing an I-beam, as rolled from a single piece of wrought iron, [1] was patented by Alphonse Halbou of Forges de la Providence in Marchienne-au-Pont, Belgium. [ 2 ] Bethlehem Steel , headquartered in Bethlehem, Pennsylvania , was a leading supplier of rolled structural steel of various cross-sections in American ...
The length of the floor of this bridge was four hundred feet [121.9 m], without intermediate support. The entire cost was one hundred and twenty-five dollars. They charged a toll of one cent per passenger, and when, from that revenue, the cost of the structure was realized they made the structure free.
Total length: 6,016 ft (1,833.7 m; 1.1 mi) [a] ... The iron railings were produced by Janes ... A seaman who had been hired to determine the height of the span ...
Examples include a 50-foot (15 m) long iron Howe truss was built for the Boston and Providence Railroad [2] [30] and a 30-foot (9.1 m) long railroad bridge over the Ohio and Erie Canal in Cleveland. [31] [32] Iron, however, was the preferred bridge for automobile and railroads, and the Howe truss did not adapt well to all-iron construction. [1]
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