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1925 in American television

From Wikipedia, the free encyclopedia

This is a list of American television-related events in 1925.

Events

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  • June 13 – The American inventor Charles Francis Jenkins publicly demonstrated the synchronized transmission of silhouette pictures. In 1925, Jenkins used a Nipkow disk and transmitted the silhouette image of a toy windmill in motion, over a distance of 5 mi (8.0 km) (from a naval radio station in Maryland to his laboratory in Washington, D.C.), using a lensed disk scanner with a 48-line resolution.[1][2]
  • June 30 - The American inventor Charles Francis Jenkins was granted U.S. patent 1,544,156 (Transmitting Pictures over Wireless). He had filed for this patent on March 13, 1922.[3]
  • Specific date unknown –
    • The American inventor Vladimir Zworykin had worked on the development of an electronic camera tube since 1923, while working for Westinghouse Electric. In a 1925 demonstration of Zworykin's device, the image was dim, it had low contrast and poor definition, and it was stationary.[4]
    • In 1923, Vladimir Zworykin had applied for a television patent in the United States. He summarized the resulting invention in two patent applications. The first, entitled "Television Systems", was filed on December 29, 1923. It was followed by a second application in 1925 of essentially the same content, but with minor changes and the addition of a Paget-type RGB raster screen for color transmission and reception.He was awarded a patent for the 1925 application in 1928. [5]

Births

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Deaths

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References

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  1. ^ "Radio Shows Far Away Objects in Motion". The New York Times. June 14, 1925. p. 1.
  2. ^ Glinsky, Albert (2000). Theremin: Ether Music and Espionage. Urbana, Illinois: University of Illinois Press. pp. 41–45. ISBN 978-0-252-02582-2.
  3. ^ U.S. patent 1,544,156
  4. ^ Abramson, Albert, Zworykin, Pioneer of Television, University of Illinois Press, 1995, p. 51. ISBN 0-252-02104-5.
  5. ^ US Patent 1691324, Zworykin, Vladimir, "Television System", issued November 13, 1928