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Drawing based on File:Gramme Ring - 1 coil - 1 pole.png. Description from there:

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 w:Hawkins Electrical Guide.

Scanned by Dale Mahalko, Gilman, WI, USA
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Other versions Original: File:Gramme Ring - 1 coil - 1 pole.png
 
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current15:45, 31 March 2008Thumbnail for version as of 15:45, 31 March 2008720 × 334 (17 KB)BorbFixed background.
15:44, 31 March 2008Thumbnail for version as of 15:44, 31 March 2008720 × 334 (17 KB)Borb{{Information |Description=Drawing based on w:Image:Gramme_Ring_-_1_coil_-_1_pole.png. Description from there: Public Domain source: * Hawkins Electrical Guide, Volume 1 * Chapter 14: The Dynamo: Current Commutation, Page 174. * Copyrigh

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