File:Laboratory electromagnet.png

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DescriptionLaboratory electromagnet.png	English: Drawing of a powerful electromagnet used in physics laboratories built by H. du Bois, from around 1910. The large curved cylinders on each side are the windings, which are connected to a source of DC electricity through the terminals visible at the base of each winding. The pole pieces visible in the center are conical shaped to concentrate the magnetic field. The shafts projecting from the curved sides are hand screws which hold the pole pieces on, so different shaped pole pieces can be attached. The accompanying text says only "An excellent form of electromagnet for production of very powerful fields has been designed by H. du Bois (fig.6)." Alterations to image: Converted image to greyscale to eliminate reddish-brown tint of background (probably due to aging of paper stock), increased brightness of background to white to get rid of JPEG artifacts, converted JPEG to 32 grayscale PNG.
Date	1910
Source	Downloaded August 12, 2008 from John Ambrose Fleming (1910) Electromagnetism in Encyclopaedia Britannica, 11th Ed., Vol. 9, The Encyclopaedia Britannica Co., USA, p.231, fig.6
Author	John Ambrose Fleming
Permission (Reusing this file)	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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	Date/Time	Thumbnail	Dimensions	User	Comment
current	10:13, 12 August 2008		705 × 710 (82 KB)	Chetvorno (talk \| contribs)	{{Information \|Description={{en\|1=Drawing of an electromagnet used in physics laboratories built by H. du Bois. Alterations to image: Converted image to greyscale to eliminate reddish-brown tint of background (probably due to aging of paper), increased b

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