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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 ...
Magic Eye tube used for tuning in a 1939 Mission Bell Model 410 radio. (green glow) In 1932, DuMont invented the magic eye tube, or Electron Ray Tube, [14] used as a tuning accessory in radios and as a level meter in mono and stereo home reel-to-reel tape recorders. In the 1930s the manufacture of mechanical panel meters were labor-intensive ...
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An illustration of some of the optical devices available for laboratory work in England in 1858. An optical instrument is a device that processes light waves (or photons), either to enhance an image for viewing or to analyze and determine their characteristic properties.
Tenyo published its first book in late 1991 titled Miru Miru Mega Yokunaru Magic Eye ("Your Eyesight Gets Better & Better in a Very Short Rate of Time: Magic Eye"), sending sales representatives out to street corners to demonstrate how to see the hidden image. Within a few weeks the first Japanese book became a best seller, as did the second ...
Close-up of the headstock of a Portuguese guitar. Preston tuners or machines (also known as peacock, fan, or watchkey tuners) is a type of machine head tuning system for string instruments, named for English cittern (English guitar) maker John Preston and developed in the 18th century.
Christopher William Tyler is a neuroscientist, [1] creator of the autostereogram ("Magic Eye" pictures), [2] and is the Head of the Brain Imaging Center at the Smith-Kettlewell Eye Research Institute [1] He also holds a professorship at City University of London. [3]