Mu-metal_assortment_1951.jpg
Summary
Description Mu-metal assortment 1951.jpg |
English:
An assortment of
mu-metal
shapes from a 1951 advertisement in an electronics magazine. Mu-metal is a nickel iron alloy which has an extremely high magnetic
permeability
. It is used for shielding a variety of electronic equipment from magnetic fields. The conical shapes in background are
cathode ray tube
shields. The boxes at right are transformer shields.
|
Date | |
Source | Retrieved November 10, 2015 from Electronics magazine, McGraw-Hill Publishing Co., New York, Vol. 24, No. 2, February 1951, p. 149 on http://www.americanradiohistory.com |
Author | Unknown author Unknown author |
Permission
( Reusing this file ) |
This image is from an advertisement without a copyright notice published in a 1951 US 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. |
Licensing
Public domain Public domain false false |
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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