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I have endeavored to devise a simple means of securing a positive warm ether for anesthesia, a method which would employ the principles of the open mask and would have the added feature of a warm anesthetic. To do this I have employed the ordinary mask and have superimposed on it an electric heating coil. This coil is built about a seamless brass tube placed vertically to the top of the mask. The tube at various levels has wire gauze screens and plates which become heated from the surrounding coil, and which in turn heat the ether as it is passing through them. The coil is attached to the mask by means of a casing which extends part way down over the mask proper. The coil and casing may be quickly detached from the mask by a slight turn to the right, leaving the mask free. The coil is built
Snyder JW. A NEW METHOD FOR ETHER ADMINISTRATION. JAMA. 1915;LXIV(21):1754–1755. doi:10.1001/jama.1915.25710470002013b
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