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To the Editor:—
It is often a distinct advantage to have statistical or other textual material typed or printed on small transparencies to be used as projection slides for large medical meetings and even for small conferences in most hospitals. A major obstacle to preparation of such slides in the latter instance is the cost involved, especially when the slides are to be used only once or very infrequently. Most slides are composed of a cellophane transparency, on each side of which lines are inscribed by means of carbon paper, usually red. These transparencies then are enclosed between two 3- × 4-in. glass squares, and the edges are sealed with opaque cellophane tape, usually red or black.For 2 years I have been making slides with 3- × 4-in. squares of old unused film substituted for the glass squares. This began out of necessity when the glass was unavailable, and
Kevorkian J. Unbreakable Light-Weight Projection Slides Made of Unused X-Ray Film. JAMA. 1963;185(8):672. doi:10.1001/jama.1963.03060080068025