The standard electrical dictionary : a popular encyclopaedia of words and terms used in the practice of electrical engineering (1898)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · London : Crosby Lockwood and Son · leaf 97
nd press against the commutator surface. Brush, Third. A third brush is sometimes provided in a dyna-mo for regulating purposes. Applied to a series machine it adjoinsone of the regular brushes and delivers its current to a resistance,to whose further end the regular circuit is connected. By a… … Fig. 70. Third Brush Regulation. It is to be distinguished from the pilot brush used for determiningthe characteristic of the commutator, although based on the samegeneral principles. Brush, Wire Gauze. A collecting or commutator brush fora dynamo or motor, which brush is made of wire gauze rolled…
Electricity
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