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Excerpt from The Electrical Age, Vol. 24: An Illustrated Weekly Electrical Journal; August December, 1899
In my next experiment I placed again a photographic plate in the tray with the film down. Then I took the hard rubber tray in my hand and placed my fingers on the outside of the bottom of the same and held them in posi tion the usual time. The result of the experiment was a plain imprint of my fingers on the film. As the plate rested on the four little buttons of the bottom of the tray, the rays therefore passed through in. Thick hard rubber and a sheet of solution.
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