Sleep Disorders
Irregular sleep-wake rhythm disorder
Mar. 21, 2024
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Blast furnace during slag tapping
"This is a better hood than average and at times catches the fumes very well, but not when the wind is in the wrong direction, as it was when this photograph was taken. A good feature here is the long rod which the man uses, enabling him to stand outside of the smoky area. However, to close the tap he must approach nearer." (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.)