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Mafa metallurgy

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The furnace is clay tower with a pot-bellied compartment. It has two openings: a long one in the lower part (combustion chamber) where the material comes out, the other one is in the upper part (loading hole) for adding the coal and magnetite. The high part has bellows to blow air. With the openings and bellows, the furnace vaguely resembles a human female body .