File:Faraday's lodestone.png
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English: A large lodestone owned by British physicist Michael Faraday and used in his experiments. A lodestone is a naturally magnetized piece of the mineral magnetite and is a natural magnet. Before strong artificial magnets, scientists used powerful lodestones like this in experiments, attaching iron pole pieces to them to make magnets. The weight of the stone and its pole pieces is about 12 kg, and it can lift 16 kg. It originally came from Russia; the words "Siberia" and "1777" are engraved on the mounting. The stone is carved with a scene representing miners and two angels. It was photographed in the King George III collection of scientific apparatus at King's College. |
| Date | |
| Source | Retrieved December 30, 2014 from Electrical Communication magazine, International Standard Electric Corp., New York, Vol. 7, No. 1, July 1928, p. 68 on http://www.americanradiohistory.com |
| Author | Unknown author |
| Permission (Reusing this file) |
This 1928 issue of Electrical Communication magazine would have the copyright renewed in 1956. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. Search of the Renewals for Periodicals for 1955, 1956, and 1957 show no renewal entries for Electrical Communication. 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.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 01:28, 31 December 2014 | 846 × 978 (239 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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