Image:Gramme Ring - 4 coil.png

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[edit] Summary

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 Hawkins Electrical Guide.

Scanned by Dale Mahalko, Gilman, WI, USA

DMahalko (talk) 21:32, 12 January 2008 (UTC)

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Image:Gramme Ring - 4 coil.png

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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.

File history

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	Date/Time	Dimensions	User	Comment
current	21:32, 12 January 2008	1,246×642 (55 KB)	DMahalko (Talk \| contribs)	(== 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)