This historical photograph was provided by the Center for Disease Control's (CDC), National Institute for Occupational Safety and Health (NIOSH). Reprinted from the May, 1951, “Industrial Hygiene Newsletter”, the image depicted an inexpensive airflow measuring device called a velometer, which had been fitted with a probe. The device measured concentrations of pollutants in the air.
The NIOSH Historic Photo Collection from which this photograph was derived, began as the Picture File of the Industrial Hygiene Division of the 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.