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Huntington-Heberlein pot

"The pot is the lower half, the upper half consisting of the great hood and flue which is fitted over the pot during roasting. The windows in the side are opened for raking from time to time. When roasting is complete the hood is lifted off, the pot caught by a crane, tipped over, and the smoking charge dumped and crushed." (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.)