Wrought iron, which has been replaced these days by steel, was produced by hammering and forging the bloom from the bottom of the furnace. It is ductile and will bend when flexed. Wrought iron is relatively strong in tension – which is why it was used for things like the suspension chains in early suspension bridges (for example Brunel’s Clifton Suspension Bridge). It has a fibrous appearance (rather like wood) when corroded. It was used for historic ship’s anchors and in early ship’s guns (such as those found on the Bartholomew Ledges).