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Man pressing tile from dry clay in a West Virginia pottery factory

Wooden racks for the tile are at his left. “The movable die has just been raised exposing newly formed tile. A small bin from which dry, powdered clay is taken is behind the press.” (Source: CDC/Barbara Jenkins, NIOSH, 1936. Flinn RH. Neal PA, Reinhart WH, Dallavalle JM. Fulton WB, Dooley AE. Chronic manganese poisoning in an ore-crushing mill. Public Health Bulletin 1940;247:1-77. Public Health Image Library, Centers for Disease Control and Prevention, Atlanta, Georgia. Public domain.)