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