In a darkened room at Manhattan's Waldorf-Astoria Hotel this week, newsmen watched a large, opaque, glass ceiling-panel suddenly light up, flood the room with a mellow glow. There was no bulb or fluorescent tube behind the glass panel, yet its whole surface glowed evenly.
Thus Don G. Mitchell, 46-year-old president of Sylvania Electric Products Inc., showed off "Electro-Luminescence," a radically new method of producing light entirely different from either incandescent or fluorescent light. Instead of filaments or gases, the source of the light is a chemical sprayed on the inner side of...
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