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File:Gramme Ring - 4 coil.png

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Summary

Description
English: A four coil Gramme ring. The coils of A and A' sum together as do the coils of B and B', producing two pulses of power 90 degrees out of phase with each other. When coils A and A' are at maximum output, coils B and B' are at zero output.

Public Domain source:

  • Hawkins Electrical Guide, Volume 1
  • Chapter 14: The Dynamo: Current Commutation
  • Page 177, Figure 185
  • 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.
Source Scanned by Dale Mahalko, Gilman, WI, USA
Author DMahalko (talk) 21:32, 12 January 2008 (UTC)
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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
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/TimeThumbnailDimensionsUserComment
current21:32, 12 January 2008Thumbnail for version as of 21:32, 12 January 20081,246 × 642 (55 KB)DMahalko== 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, Page 177. * Copyright 1917 by Theo. Au
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