Figure 307 -- Perspective views of Crocker-Wheeler brush holder

• This holder uses parallel leaf springs supporting the brush, so that brush position can be adjusted without tilting the brush relative to the commutator surface.
• The carbon brushes are held securely in their box holders, so there are no sliding contacts in the path of the current passing through the carbon to the brush holder.

• Hawkins Electrical Guide, Volume 1
• Chapter 21: Brushes and the Brush Gear
• Page 307, Figure 335
• 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 22:39, 18 May 2008 (UTC)
• Scanned at 600dpi, 8-bit grayscale using MicroTek ScanMaker 3600
• Level-adjusted and cleaned up using Gimp 2.4.4

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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