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The magic eye (also called a cat's eye, or tuning eye in North America) is a specific type of such a tube with a circular display similar to the EM34 illustrated. Its first broad application was as a tuning indicator in radio receivers , to give an indication of the relative strength of the received radio signal, to show when a radio station ...
Double-ended cat's eye is Shaw's original design and marks road centre-line. The inventor of cat's eyes was Percy Shaw of Boothtown, Halifax, West Yorkshire, England.When the tram-lines were removed in the nearby suburb of Ambler Thorn, he realised that he had been using the polished steel rails to navigate at night. [3]
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The retroreflective glass spheres shown set into a cat's eye in the United Kingdom. Shaw was inventive, even at an early age, but his most famous invention was the cat's eye for lighting the way along roads in the dark. There are several stories about how he came up with the idea.
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