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Updated: May 1, 2025
THE NEW YORK TIMES gave the following report of a 1937 demonstration of the electron microscope before a meeting of the American Association for the Advancement of Science: "The crystalline structure of tungsten, hitherto known only indirectly by means of X-rays, stood outlined boldly on a fluorescent screen, showing nine atoms in their correct positions in the space lattice, a cube, with one atom in each corner and one in the center.
That clairvoyance which consists in the ability to perceive not alone the superficies of things as ordinary vision perceives them, but their interiors as well, is analogous to the power given by the X-ray, by means of which, on a fluorescent screen, a man may behold the beating of his own heart.
Glass may be rendered fluorescent, as is seen in the Geisler and Crookes tubes. Edison conceived the project of using this phenomenon to get back the invisible rays into visibility. The substance which he employed was the tungstate of calcium.
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