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The StüCkenofen was a type of high bloomery furnace used in iron smelting. It featured a taller shaft than earlier designs and produced large blooms of iron that needed to be removed from a front opening. This furnace evolved from earlier bloomery hearths, which were used to smelt iron ore by heating it with charcoal. The process resulted in a spongy mass of metal interspersed with slag, as primitive furnaces couldn't reach iron's melting point. This bloom was then reheated and hammered to remove slag and create wrought iron.12

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