Farnsworth_image_dissector_tube.jpg
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Summary
| Description |
English:
One of the first experimental
video camera tubes
, called an
image dissector
, designed by American engineer
Philo T. Farnsworth
in 1930.
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| Date | |
| Source | Retrieved March 19, 2014 from Philo T. Farnsworth, "Scanning with an electric pencil" in Television News magazine, Popular Book Corp., New York, Vol. 1, No. 1, March-April 1931, p. 51, fig. A on [1] website |
| Author | Philo T. Farnsworth |
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Permission
( Reusing this file ) |
This 1931 issue of Television News magazine would have the copyright renewed in 1959. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. [2] Search of the Renewals for Periodicals for 1958, 1959 and 1960 show no renewal entries for Radio World . Therefore the magazine's copyright was not renewed and it is in the public domain. |
Licensing
|
This work is in the
public domain
because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the
copyright was not renewed
. For further explanation, see
Commons:Hirtle chart
and
the copyright renewal logs
. Note that it may still be copyrighted in jurisdictions that do not apply the
rule of the shorter term
for US works (depending on the date of the author's death), such as Canada (70 years
p.m.a.
), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
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