Fail:Blattnerphone recorder 1937.jpg
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Ringkasan
| Keterangan |
English: Blattnerphone steel tape recorder, an early magnetic recording technology, developed by Dr. Kurt Stille and Louis Blattner in 1924, at BBC studios, used to record programs for rebroadcast in Empire countries. The recording tape was 3mm wide and 0.08 mm thick, and traveled at 1.5 meters / second. It was limited to voice programs as it did not have the fidelity to record music. Caption: "One of the Blattnerphone BBC recording machines on which the programs are recorded by a magnetic process for Empire broadcasting" |
| Tarikh | |
| Sumber | Retrieved April 11, 2014 from Douglas Hallam, Jr., "The BBC Program Transmission System", in Communication and Broadcast Engineering magazine, Bryan Davis Publishing Co., New York, Vol. 4, No. 2, February 1937, p. 13 on American Radio History website |
| Pengarang | Douglas Hallam, Jr. |
| Kebenaran (Penggunaan semula fail ini) |
This 1937 issue of Communication and Broadcast Engineering magazine would have the copyright renewed in 1955. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. [1] Search of the Renewals for Periodicals for 1954, 1955 and 1956 show no renewal entries for Communication and Broadcast Engineering. Therefore the magazine's copyright was not renewed and it is in the public domain. |
Perlesenan
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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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