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Softening furnace in a refinery with mechanical charging

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"The pigs of bullion come down the closed chute to the charge door. In contrast to this excellent device is the carelessness which allows heaps of dusty dross to lie on the floor near the furnace." (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.)