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At the suggestion of a colleague who saw me using it, I am here describing a transparent mask which I made several years ago to protect my face during oral and nasal examinations. It consists of a film and two round head paper fasteners one-half inch long. A roentgenogram that has been spoiled or is of no more value as a negative is washed of its emulsion. A 14 by 17 inch film when cut into four parts will make shields 7 by 8½ inches each, which is the proper size for the average face. From the center of one of the 7 inch ends, an isosceles triangle of 3 inch base and 2½ inch vertex is cut. Two holes as large as the heads of the paper clasps are then cut 1 inch from the 8½ inch sides and one-half inch from the cut 7 inch end (fig. 1).
Kaplan D. A TRANSPARENT MASK. JAMA. 1930;94(14):1063. doi:10.1001/jama.1930.27120400001014
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