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 w:Hawkins Electrical Guide.
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