Public donations also purchased this Hubbard tank. The tank’s shape, with its narrow “waist”, allowed attendants to work with the patient without removing him or her from the bath. The water in this was likely heated and agitators provided a gentle “massage”. This is probably being used to treat a joint disorder such as juvenile arthritis.
The man at the far right appears to be Robert Jolly, superintendent of Memorial Hospital and husband of Lillie Jolly of nursing fame.
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Memorial Hospital System, "Hydrotherapy Machine: Therapeutic Bath" (1937). Library Exhibit Images. 147.