Image: Lodestone attracting nails
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Original image (532 × 668 pixels, file size: 114 KB, MIME type: image/png)
Description: 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".
Title: Lodestone attracting nails
Credit: 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
Author: Fred Anzley Annet
Permission: Public Domain in USA - published in USA prior to 1923
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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