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Thanks. It is a brake drum from a dump truck. The air blower is an old shop vac. My sister provided the coal. Coal is often hard to find. She happened to buy a house that doesn't have a coal furnace anymore, but the pit in the basement is still full. It is anthracite (hard coal). Most blacksmiths prefer bituminous coal, but it seemed about the same to me. The bituminous coal crumbles and makes a lot of dust.