Image:Gramme Ring - 1 coil - 1 pole.png

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[edit] Summary

Separate excitation of an electric generator. DC generator with commutation is shown, but the principle also applies to AC alternators.

Public Domain source:

• Hawkins Electrical Guide, Volume 1
• Chapter 14: The Dynamo: Current Commutation, Page 174.
• Copyright 1917 by Theo. Audel & Co.
• Printed in the United States

For a list of all these illustrations used in Wikipedia please see the article Hawkins Electrical Guide.

Scanned by Dale Mahalko, Gilman, WI, USA

DMahalko (talk) 21:09, 12 January 2008 (UTC)

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[edit] Licensing

This image is in the public domain in the United States. In most cases, this means that it was first published prior to January 1, 1923 (see the template documentation for more cases). Other jurisdictions may have other rules, and this image might not be in the public domain outside the United States. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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