In a streamlined dentists' office just off Manhattan's Fifth Avenue a decided improvement in X-ray could be seen last week. It consisted of some amazing X-ray transparencies. Each one appeared fuzzy to the naked eye, like seeing double. But through polaroid eyeglasses each transparency was a clear, three-dimensional, stereoscopic view into a body. A pencil moving over a film of the chest seemed to move among the ribs, poke the heart. Three dentist brothers, Edward, Milton, Harold Klein, perfected the method.
The trouble with most previous stereoscopic X-rays, the Kleins explain,* was that...
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