File:Soundscriber dictation machine.jpg
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| Description |
English: Soundscriber, an early dictation machine that recorded sound with a stylus on a thin vinyl disk. The system could record 15 minutes of dictation on each side of the 7 inch disk at 33 RPM, at a density of 200 grooves per inch. Disks cost about 10 cents. Unlike conventional records, in which the sound vibrations were recorded as lateral, sideways motions of the stylus, and the groove is actually cut into the record, the Soundscriber records sound by vertical motions of the stylus, so the depth of the groove represents the amplitude of the audio signal. The stylus embosses the groove into the vinyl without cutting, so no plastic waste is produced. |
| Date | |
| Source | Retrieved June 11, 2014 from Stanley Kempner, "The Soundscriber" in Radio News magazine, Ziff-Davis Publishing Co., New York, Vol. 32, No. 3, September 1944, p. 43 on American Radio History website |
| Author | Unknown author |
| Permission (Reusing this file) |
This 1944 issue of Radio News magazine would have the copyright renewed in 1972. 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 1972 show no renewal entries for Radio News. Therefore the magazine's copyright was not renewed and it is in the public domain. |
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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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:27, 11 June 2014 | | 1,042 × 735 (207 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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