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The accompanying illustration represents a cover which I have devised for a drop-ether mask. It is made by quilting cotton between two layers of No. 2 gauze, cutting a hole 1½ inches in diameter in the summit, taking out one or two wedge-shaped pieces at the base so as to cause the cover to lit the mask, and hemming all raw surfaces with tape.
The ordinary ether-mask is covered with a few layers of gauze. Ether is given by the drop method slowly at first, and as soon as the patient becomes accustomed to the vapor, the above-described arrangement is fitted over the mask, with the base carefully approximated to the patient's face, and the drug is then dropped onto the gauze through the aperture. By this method patients are put under and kept under the anesthetic with a minimum amount of drug, the anesthesia is much more uniform and
Parsons CG. AN ETHER-MASK COVER. JAMA. 1912;LIX(21):1886. doi:10.1001/jama.1912.04270110300019