File:Puddling furnace – cross section, Otto's Encyclopedia.jpg
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![File:Puddling furnace – cross section, Otto's Encyclopedia.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Puddling_furnace_%E2%80%93_cross_section%2C_Otto%27s_Encyclopedia.jpg/800px-Puddling_furnace_%E2%80%93_cross_section%2C_Otto%27s_Encyclopedia.jpg?20140426195750)
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