Provided by the Center for Disease Control's (CDC), National Institute for Occupational Safety and Health (NIOSH), this historic image depicted a male industrial worker who was inside a West Virginia tile-making factory stationed at a clay extrusion machine. Extrusion involved the application of pressure to the moist clay, however, spillover of moist debris that would dry, often released airborne silicate particles, especially during sweeping in and around his workstation. In so doing, these workers were prone to inhaling these particulates, which lead to the chronic pulmonary disease known as pneumoconiosis, or silicosis, or more commonly known as 'grinders' disease', characterized by the formation of nodular fibrotic changes in the lungs. Note that this man was not wearing a filtered breathing mask, thereby, increasing his chances of contracting silicosis. The image was published in the 'Public Health Bulletin', No. 244, 1939.
CDC/ Barbara Jenkins, NIOSH
December 4, 2012