Fil:Alnico magnet assortment.jpg
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Denne fil er fra Wikimedia Commons. Beskrivelsen af filen fra Commons er gengivet nedenfor. |
Beskrivelse
| Beskrivelse |
English: An assortment of Alnico magnets produced by The Arnold Engineering Co. in 1956. These are probably cast isotropic Alnico 5 magnets, and show the large range of shapes manufactured for use in devices such as loudspeakers, ammeters, and small DC electric motors. Invented during World War 2, Alnico 5 was at that time the most powerful magnet in the world. It's development created a new generation of compact permanent magnet motors and loudspeakers, devices which before the war had used DC electromagnets. Alterations to image: Cropped out surrounding ad copy. |
| Dato | |
| Kilde | Retrieved June 16, 2014 from Tele-Tech and Electronic Industries magazine, Caldwell-Clements Inc., Bristol, Connecticut, Vol. 15, No. 1, January 1956, p. 46 on American Radio History website |
| Forfatter | Ukendt |
| Tilladelse (Genbrug af denne fil) |
This image is from an advertisement for The Arnold Engineering Co. without a copyright notice published in a 1956 magazine. In the United States, advertisements published in collective works (magazines and newspapers) are not covered by the copyright notice for the entire collective work. (See U.S. Copyright Office Circular 3, "Copyright Notice", page 3, "Contributions to Collective Works".) Since the advertisement was published before 1978 without a copyright notice, it falls into the public domain. |
Licensering
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This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. 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 (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
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| nuværende | 25. jun. 2014, 11:53 | | 1.123 × 841 (150 KB) | Chetvorno | User created page with UploadWizard |
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