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The material was rarely used for the columns, as the cast was both stronger under compression and cheaper, so a typical iron frame building in the second half of the 19th century had cast iron columns and wrought iron beams. Columns at the Crystal Palace (1851), as well as short trusses, were made from the cast iron, while longer beams used ...
Cast iron was also taken up by some architects in the early 19th century where smaller supports or larger spans were required (and where wrought iron was too expensive), notably in the Royal Pavilion in Brighton, designed by John Nash and built between 1816 and 1823, where cast iron columns were used within the walls, as well as cast iron beams ...
An arc of Phoenix Columns adorns a plaza outside the old foundry building. The Phoenix Column, patented by Samuel Reeves in 1862, was a hollow cylinder composed of four, six, or eight wrought iron segments riveted together. The resulting column was much lighter and stronger than the solid cast iron columns of the day. [9]
Details of the top of iron pillar, Qutb Minar, Delhi. The iron pillar in India was produced by the forge welding of pieces of wrought iron. In a report published in the journal Current Science, R. Balasubramaniam of IIT Kanpur explains how the pillar's resistance to corrosion is due to a passive protective film at the iron-rust interface.
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.
To reduce the weight these had to support, Bouch used open-lattice iron skeleton piers; each pier had multiple cast-iron columns taking the weight of the bridging girders. Wrought iron horizontal braces and diagonal tiebars linked the columns in each pier to provide rigidity and stability. Original Tay Bridge from the north, c. 1878
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