Figure 329-332 -- Various forms of brush

• Fig 329 - gauze brush
• Fig 330 - laminated or strip brush
• Fig 331 - strip and wire brush as used on early Edison machines
• Fig 332 - carbon brush

Carbon is preferred to copper for brushes, on account of the reduction of sparking secured by its use.

• Hawkins Electrical Guide, Volume 1
• Chapter 21: Brushes and the Brush Gear
• Page 304, Figures 329, 330, 331, 332
• 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 19:12, 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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