In Dresden in 1880, Winckel devised a warming bath to be used for premature and asphyxiated infants, and published a description in Centralblatt Gynakologie in 1882. The diagram below is from Winckel's paper.
The next sketch, which gives you an idea of how the device looked in real life, is from Joseph De Lee's 1901 article "Infant Incubation, with the Presentation of a New Incubator and a Description of the System at the Chicago Lying-In Hospital", 1901.
