These photos are from the Philadelphia Historical Digital Image Library.
Above: Baby in a "rocking" incubator ca. 1936. Babies' Hospital, Philadelphia.
Above: American Legion gift of an infant incubator to the Women's Southern Homeopathic Hospital, ca. 1942.
Above: Nurse with incubators at the Kensington Hospital for Women, ca. 1940.
Above: Presentation of a modern incubator for the nursery of the Northern Liberties Hospital, June 14, 1937.
Above: Infant occupation of a newly developed incubator at Doctor's Hospital, 1942.