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Description:This historical drawing, provided by the Center for Disease Control's (CDC), National Institute for Occupational Safety and Health (NIOSH), detailed how to modify a basic electrical circuit on a Mine Safety Appliances (M.S.A.), electrostatic precipitator, model CT-43134, to handle a 6 volt direct current (D.C.) operation. The device filtered unburned particles from industrial burning operations, such as in the case of coal-fired electrical power plants, by electrically charging, or “ionizing” the particles. The positively-charged particles then move toward negatively-charged collecting electrodes, where they are trapped. The particles adhere to the collection plates and build up into larger particles. The plates are then tapped, or “rapped”, which loosens the partcles that then fall into hoppers for collection and disposal. The drawing was published in the May, 1952 journal entitled, “Occupational Health”.
The NIOSH Historic Photo Collection began as the “picture file” of the Industrial Hygiene Division of the U.S. Public Health Service (USPHS), c. 1930-1960. It is a unique collection of mid-20th Century images of American workers and workplaces and documents occupational safety and health research of that era. The collection consists of approximately 1,000 original photographs and schematic drawings.
High Resolution: Click here for hi-resolution image (14.2 MB)
Content Providers(s):CDC/ Barbara Jenkins, NIOSH
Creation Date:1952
Photo Credit:Unknown
Links:United States Environmental Protection Agency (EPA)
CDC – Nat. Institute of Occupational Safety and Health (NIOSH) – About NIOSH
CDC Organization
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Copyright Restrictions:None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.