"Nurse Training. Care of prematurely born babies is one of the most complicated procedures which must be learned by the student nurse. Feeding, bathing, and diaper changing are carried out inside the incubator, in which temperature, humidity and oxygen must be carefully regulated. The oxygen tank can be seen in the background."
-- United States, Office of War Information, Overseas Picture Division, Washington. Photo by Fritz Henle, November, 1942.