Science: Blind Man's Radar

The blind may soon have an electrical gadget to help them get around without bumping into obstacles. The basic idea, now being worked on by the Army Signal Corps, is a small box shooting out a narrow beam of light. By turning the beam from side to side, the blind man can feel his way. When the beam hits a lamppost, a fence or any such obstacle, its light reflects back to a lens and is focused on a photoelectric cell. A gentle buzz in an earphone warns him that the obstacle is near....

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