Alan Mays' photos with the keyword: demonstrations

A medical photo for the Vintage Photos Theme Park. A real photo postcard published by the Grogan Photo Co., Danville, Ill. Postmarked Chicago, Ill., July 13, 1946. " Iron lungs ," a colloquial term for negative pressure ventilators (these medical devices are no longer called "respirators"), were notably used in the 1940s and 1950s to treat polio patients with paralyzed lungs. Fortunately, with the development of vaccines to prevent polio and the development of new types of ventilators and treatments, iron lungs are now used only infrequently.