Figure 327 -- Sectional view of a General Eletric commutator.

• The segments are of rolled or forged copper and are separated by soft mica insulating sheets. This mica must wear down evenly with the copper, hence its consistency is important.
• The segments are wedge shaped so that when drawn radially inward they support each other likes stones in an arch. They are drawn together by hollow cone collars which bear upon lugs projecting from the ends of the segments. These lugs are turned to form a smooth cone after the segments are assembled.
• The collars are insulated with mica from the segments are they are held in place by nuts upon the commutator shell or by bolts passing from end to end through the segments.
• The segments are also provided with lugs for connection to the windings.

• Hawkins Electrical Guide, Volume 2
• Chapter 20: Commutation and the Commutator
• Page 200, Figure 327
• Copyright 1917 by Theo. Audel & Co.
• Printed in the United States

• Scanned by User:DMahalko, Dale Mahalko, Gilman, WI, USA -- Email: dmahalko@gmail.com, on 17:35, 18 May 2008 (UTC)
• Scanned at 600dpi, 8-bit grayscale using MicroTek ScanMaker 3600
• Level-adjusted and cleaned up using Gimp 2.2

For a list of all these illustrations used in Wikipedia please see the article Hawkins Electric Guide on the English Wikipedia.

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