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Thomas William Henry Harrison Moseley (November 28, 1813 – March 10, 1880) was a builder and designer of wrought-iron arch bridges.He is best known for his "Wrought-Iron Lattice Girder Bridge" patent of August 30, 1870.
It was the first bridge in the United States to use riveted wrought iron plates for the triangular-shaped top chord. [ 1 ] The bridge was completed in 1864 as Moseley Truss Bridge built by the Moseley Iron Building Works of Boston , to connect the Pacific Mills with Canal Street in Lawrence, Massachusetts , by spanning the North Canal . [ 3 ]
Cast iron was not useful for items in tension like beams, where the more expensive wrought iron was preferred. Improvements in production saw the costs decrease at the same time as cast iron gained popularity. The puddling process, patented in 1784, was a relatively low cost method for producing a structural grade wrought iron.
Rose Pergola at Kew Gardens, London A pergola covered by wisteria at a private home in Alabama Pergola type arbor. A pergola is most commonly an outdoor garden feature forming a shaded walkway, passageway, or sitting area of vertical posts or pillars that usually support crossbeams and a sturdy open lattice, often upon which woody vines are trained. [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.
In China, the oldest existing arch bridge is the Zhaozhou Bridge of 605 AD, which combined a very low span-to-rise ratio of 5.2:1, with the use of spandrel arches (buttressed with iron brackets). The Zhaozhou Bridge, with a length of 167 feet (51 m) and span of 123 feet (37 m), is the world's first wholly stone open-spandrel segmental arch ...
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