This historic image was provided by the Center for Disease Control's (CDC), National Institute for Occupational Safety and Health (NIOSH), depicted two industrial workers operating the stopper in the act of pouring an ingot of 'rimmed steel', inside a steel works. Rimmed steel is a low-carbon form of the metal, which contains iron oxide in a quantity that causes the mixture to release a continuous flow of the toxic gas, carbon monoxide (CO), during the hardening of the ingot. This process ends with the creation of a 'case', or 'rim' of the metal, which is for the most part, free of pockets, or voids. The surface of rimmed steel-made products, reveal a very high-quality character. The CO released, in such high quantities made proper ventilation paramount in these factories. A industrial hygienist could be seen taking air samples around the workers. This photograph was published in the 1948, edition No. 299 of the 'Public Health Bulletin'.
CDC/ Barbara Jenkins, NIOSH
November 6, 2012
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