At Purdue University (Lafayette, Ind.) Physicist Karl Lark-Horovitz last week showed big magic lantern pictures of atoms in action. In oldtime magic lanterns, a strong light shone through an illustrated glass slide. A lens projected an enlarged image of the picture upon a screen several feet away from the lantern. In Dr. Lark-Horovitz's arrangement the screen is a sheet of sensitive photographic film 9 ft. from the lantern light. The lantern light is a vacuum tube projecting a strong beam of x-rays. For slides he used a thin sheet of copper or shallow...
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