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Ironwork is any weapon, artwork, utensil, or architectural feature made of iron, especially one used for decoration. There are two main types of ironwork: wrought iron and cast iron. While the use of iron dates as far back as 4000 BC, it was the Hittites who first knew how to extract it (see iron ore) and develop weapons.
On top, the chords form an arch of nine tangential castings of an inverted-U cast-iron bars which compress in response to a load. They are matched by bottom chords of two lines of nine wrought-iron open links, made from one-and-a-half-inch (38 mm) square bars, which restrain the compression.
Portcullis at Desmond Castle, Adare, County Limerick, Ireland The inner portcullis of the Torre dell'Elefante in Cagliari, Sardinia, Italy A portcullis (from Old French porte coleice 'sliding gate') is a heavy, vertically closing gate typically found in medieval fortifications. [1]