Cast iron and wrought iron were both used to construct the gas holder frames at the Pancras gas works. Cast iron can be melted down and poured into a mould to shape and solidify. Wrought iron is made by reprocessing cast iron, and is said to be stronger than cast iron due to the way it is made; the strength of wrought iron is more certain than cast iron. Wrought iron is often used present day to construct gates and fences.
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