ring C 1 . Two small brushes, B B 1 , of wire gauze or carbon, rubbing continuously against these collecting rings, connect them with a wire which completes the circuit. The armature, as the revolving coil is called, is mounted between the poles of a magnet, where the lines of force are thickest. These lines are supposed to stream from the N. to the S. pole.
In Fig. 67 the armature has reached a