This apparatus is a “fever cabinet”, used to raise a patient’s body temperature for therapeutic purposes. Induced fevers were used to treat several conditions, including some infections and forms of arthritis. A related picture shows this machine being used on a child, so it, along with the Hubbard tank, may have been part of an effort to treat a childhood joint ailment by increasing circulation.
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Memorial Hospital System, "Memorial Hospital Fever Box" (1935). Exhibit Images. 148.