Image:Gramme Ring - 6 coil - 3 pole.png

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[edit] Summary

From illustration caption:

Gramme ring armature with six coils. The sine curves 1, 2, and 3, represent the conditions due to coils AA', BB', and CC', respectively and 4, the resultant pulsations.

Public Domain source:

• Hawkins Electrical Guide, Volume 1
• Chapter 14: The Dynamo: Current Commutation
• Page 178, Figure 186
• 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) 21:51, 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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