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Fabre du Faur zinc distillation furnace

"The retort is shown with the zinc condenser in place. When this is removed the rich lead or dore runs out. There is no hood to catch the fumes." (Source: Hamilton A. Lead poisoning in the smelting and refining of lead. Industrial Accidents and Hygiene Series No. 4. Bulletin of the U.S. Bureau of Labor Statistics 1914a;141:1-97. Public domain.)