Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 95
C is placed the pressure spring. give rise to excessive sparking and also heating of the armature,the metallic dust given off appearing to lodge between thesegments of the commutator, thus partially short circuiting the BRUSHES AND THE BRUSH GEAR 307 armature. To obviate this, carbon brushes are… … Fig. 335—Perspective views of Crocker Wheeler brush holder. This holder is of the paralleltype in which the brushes may be adjusted without affecting the lead. Each brush is heldrigidly in its box and there are no sliding contacts in the path of the current. The holderis further described under…
Electrical engineering
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