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Photographic prints of x-ray films used for publication up to the present have been more or less unsatisfactory. For a long time physicians have felt the need of perfecting the details of x-ray pictures so that they might be used more effectively in illustrative work. The positive x-ray prints which one sees in textbooks require description in detail, and many of them have to be retouched. Likewise, lantern slides made from x-ray films lose much of their detail and require considerable identification when they are presented.
The process by which the photographs exhibited here are made consists in first printing a positive film of the original negative. In other words, two films are necessary to attain these results. Although the idea of using both a positive and a negative film has been expounded for various purposes in ordinary photography in the past, never before, apparently, has this idea been applied
THEOBALD WH. NEW ADAPTATION OF X-RAY PRINTS AND SLIDES (DEMONSTRATION). Arch Otolaryngol. 1934;19(6):704–707. doi:10.1001/archotol.1934.03790060053006
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