The high resistance or carbon brush is made large enough that it is significantly wider than the insulating segment that it spans ( and on large machines may often span two insulating segments ).
22.
This type of patina is formed by corrosion, what elements the air might hold, residue from the wear of the carbon brush and moisture; thus, the patina need special conditions to work as intended.
23.
In 1913, 29 years old, he and the mechanic and machine fitter Karl Ebe, who had also gathered experience in the carbon industry, founded the carbon brush factory of Schunk & Ebe oHG in Fulda.
24.
Modern devices using carbon brushes usually have a maintenance-free design that requires no adjustment throughout the life of the device, using a fixed-position brush holder slot and a combined brush-spring-cable assembly that fits into the slot.
25.
In addition to the commonly used heat, torque, and tonnage methods of seasoning commutators, some high performance commutator applications require a more expensive, specific " spin seasoning " process or over-speed spin-testing to guarantee stability of the individual segments and prevent premature wear of the carbon brushes.
26.
With the introduction of the electric powered U . S . Mark 18 torpedo, ethyl alcohol was no longer required for torpedoes; however, limited quantities of denatured alcohol were ( and are ) still required by the Electrician's Mates and Interior Communications Electricians on board ship for the purpose of cleaning slip rings, commutators, and carbon brushes on a wide variety of equipment.
