An old blast furnace for smelting iron is a towering, cylindrical structure made of brick and reinforced with iron bands. It features a tapered design, wider at the bottom to hold molten iron and narrower at the top where raw materials like iron ore, limestone, and charcoal are fed. Air is blown in through tuyeres at the base, creating intense heat to melt the iron ore. The molten iron collects at the bottom and is tapped periodically, while slag floats on top. Smoke escape through the chimney