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Cast iron architecture


Cast-iron architecture is a form of architecture where cast iron plays a central role. It was a prominent style in the Industrial Revolution era when cast iron was relatively cheap and modern steel had not yet been developed.

Cast iron has been used for centuries and was used in architecture in the pre-modern period; for instance, the 13th century Indian "Konark Sun Temple" used iron beams. It was in 18th-century Britain that new production methods first allowed cast iron to be produced cheaply enough and in large enough quantities to regularly be used in large building projects. One of the first important projects was The Iron Bridge in Shropshire, a precedent-setting structure made almost entirely of cast iron. However, it was grossly over-designed, and the makers (principally Abraham Darby) suffered financially as a result. The quality of the iron used in the bridge is not high, and nearly 80 brittle cracks are visible in the present structure. Later designers and engineers, such as Thomas Telford, improved both the design and quality of the material in bridges (for example, at Buildwas upstream of Coalbrookdale) and aqueducts (such as the world-famous Pontcysyllte Aqueduct in North Wales).

Cast iron was first used in pagoda construction in Tang Dynasty China. Texts written in the 9th century by the Japanese Buddhist monk Ennin describe in detail the cast-iron pagodas and statues widespread in China at the time. Persecution of Buddhism in China led to the destruction of many of these structures.Ditherington Flax Mill, built in 1796, is considered the first iron-framed building in the world.

The Commissioner's House of the Royal Naval Dockyard, Bermuda designed by Edward Holl and built in the 1820s is considered to be the first residence that used cast iron in its structural framework. In the 1850s the cheapness and availability of cast iron led James Bogardus of New York City to advocate and design buildings using cast-iron components. Cast iron could be cast into a wide array of shapes and designs, allowing elaborate facades that were far cheaper than traditional stone-carved ones. These facades could also be painted a wide array of colours. Many of these buildings had elaborate neo-classical or Romanesque designs. Mostly used on commercial and industrial buildings, there are many surviving examples, especially in the SoHo and Tribeca areas of New York and the western downtown area of Louisville, Kentucky. One of the most intact ensembles in the American West can be seen in the Skidmore/Old Town Historic District, a National Historic Landmark in Portland, Oregon. In Europe the best-preserved examples of Victorian cast-iron warehouses can be viewed in Glasgow, Scotland, a city which experienced an enormous expansion in the late 19th century. Another Victorian-era cast-iron structure is the Covered Market in Valletta, Malta, which was built between 1859 and 1861.


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