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Belt of empty grates of a Dwight-Lloyd machine

"The roasted cakes have dropped off and the man is chipping off the fragments which still stick to the grates. This is a very much better installation than many, and the man is not so much exposed to the dust as he would be were he standing below." (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.)