File:Magnetron and magnets.jpg
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| Description |
English: A magnetron tube from an advertisement in a 1954 electronics magazine, shown in its mounting beween two horseshoe-shaped alnico magnets. The tube is embraced on each end between the pole-pieces of the magnets, which create a magnetic field along the axis of the tube. The tube is a Raytheon RK6410, a fixed frequency, pulse power 2760-2850 MHz (X band), capable of 5 MW peak power. Alterations to image: cropped out rest of advertisement and rotated image to better angle. |
| Date | |
| Source | Retrieved June 15, 2014 from Tele-Tech magazine, Caldwell-Clements Inc., Bristol, Connecticut, Vol. 13, No. 11, November 1954, p. 123 on American Radio History website |
| Author | Unknown author |
| Permission (Reusing this file) |
This image is from an advertisement without a copyright notice published in a 1954 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. |
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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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:58, 17 June 2014 | | 363 × 266 (15 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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