The Hearson Thermostatic Nurse, shown below, was described in an article in the Illustrated London News in 1884. A shallow tank of water in the lower compartment was heated by oil or gas. The device cost £6 for one infant and £10 for a larger version that could accommodate two infants. In retrospect, we can see that Hearson's "invention" was directly related to the incubators pioneered by Tarnier and Auvard in Paris.