文件:Lodestone attracting nails.png

原本檔案 ‎（532 × 668 像素，檔案大細：181 KB ，MIME類型：image/png）

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摘要

描述Lodestone attracting nails.png	English: A lodestone, a piece of the mineral magnetite that is a natural magnet, from 1921 electrical engineering book. The caption of the picture said: "Natural magnet attracting iron nails".
日期	1922年
來源	Downloaded 2008-11-04 from Fred Anzley Annet (1921) Electrical Machinery: A practical study course on installation, operation, and maintenance, 1st Ed., McGraw-Hill, New York, p.11, fig.3 on Google Books
作者	Fred Anzley Annet
許可 (重用呢個檔案)	Public Domain in USA - published in USA prior to 1923

Public domain	This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.	United States
	This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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	日期／時間	縮圖	尺寸	用戶	註解
現時	2021年5月3號 (一) 14:43		532 × 668（181 KB）	Materialscientist	FFT
	2009年6月22號 (一) 05:05		532 × 668（114 KB）	Chetvorno	{{Information \|Description={{en\|A Wikipedia:lodestone, a stone that is a natural magnet, from 1922 electrical engineering book. The caption of the picture said: "Natural magnet attracting iron nails".}} \|Source=Downloaded 2008-11-04 from [http:/

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