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carbon brush

British  

noun

  1. a small block of carbon used to convey current between the stationary and moving parts of an electric generator, motor, etc

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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When replacing the block, care must be exercised in pushing the carbon brush into the socket.

From Project Gutenberg

Remove the distributor block and determine which terminal of the block is in contact with the carbon brush of the distributor finger and connect with plug wire leading to No. 1 cylinder to this terminal.

From Project Gutenberg