File:Radio equipment - Indiana State Museum - DSC00410.JPG

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English: Early radio and television equipment, Indiana State Museum, 650 West Washington Street, Indianapolis, Indiana, USA. Left to right:
  • 1915 De Forest Audion vacuum tube was the first device which could amplify electrical signals, creating the field of electronics.
  • 1923 Crosley "Pup" radio; this single tube receiver was manufactured in Cincinatti.
  • AT&T double button broadcasting microphone used in Indianapolis' first successful radio station, WFBM, established 1924.
  • 1927 experimental television receiver prototype built by Morris VanWay for RCA used a spinning disk with holes in front of a neon light to create an image. Before modern electronic scan television was developed around WW2, many radio stations broadcast experimental mechanical scan television programs.
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Source Self-photographed
Author Daderot
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(Reusing this file)		 Public domain.
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Image extraction processThis file has an extracted image: Crosley Pup radio - Indiana State Museum - DSC00410 (cropped).JPG.
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current17:01, 2 April 2011Thumbnail for version as of 17:01, 2 April 20114,320 × 3,240 (4.27 MB)Daderot (talk | contribs)

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