پرونده:Mu metal CRT shields.jpg
تفکیک‌پذیری بالاتری در دسترس نیست.
Mu_metal_CRT_shields.jpg (۳۲۵ × ۳۲۸ پیکسل، اندازهٔ پرونده: ۲۵ کیلوبایت، نوع MIME پرونده: image/jpeg)
 | این پرونده در ویکی‌انبار موجود است. محتویات صفحهٔ توصیف آن در زیر نمایش داده می‌شود. |
خلاصه
| توضیح |
English: Magnetic shields for cathode ray tubes (CRTs) made of mu metal for use in oscilloscopes, from an ad by James Millen Mfg. Co. in a 1945 electronics magazine. The electron beams used in cathode ray tubes to draw on the tube's screen could be deflected by magnetic fields from transformers and other electronic components in the oscilloscope's insides. So the sides of the long CRT tube were surrounded by a shield made of mu metal. Mu metal is a high permeability nickel-iron alloy which could shield against magnetic fields by conducting the magnetic field lines around the shielded space. |
| تاریخ | |
| منبع | Retrieved June 12, 2014 from Radio News magazine, Ziff-Davis Publishing Co., New York, Vol. 33, No. 3, March 1945, p. 12 on American Radio History site |
| پدیدآور | نامعلوم |
| اجازه‌نامه (استفادهٔ مجدد از این پرونده) |
This image is from an advertisement for James Millen Mfg. Co. without a copyright notice published in a 1945 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. |
اجازه‌نامه
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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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| تاریخ/زمان | بندانگشتی | ابعاد | کاربر | توضیح | |
|---|---|---|---|---|---|
| کنونی | ۱۴ ژوئن ۲۰۱۴، ساعت ۰۶:۴۴ | | ۳۲۵ در ۳۲۸ (۲۵ کیلوبایت) | Chetvorno | User created page with UploadWizard |
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