field magnet of the motor consists of a ring R, preferably of thin insulated iron sheets or bands with eight pole pieces G' and corresponding recesses in which four pairs of coils V are wound. The diametrically opposite pairs of coils are connected in series and the free ends connected to four terminals W. The rule to be followed in connection being the same as hereinbefore explained.
An armature D with two coils E E' at right angles to each other, is mounted to rotate inside of the field magnet R. The ends of the armature coils are connected to two pairs of contact rings d d d' d'.
The generator for this motor may be of any suitable kind to produce currents of the desired character. In the present instance it consists of a field magnet N S and an armature A with two coils at right angles, the ends of which are connected to four contact rings b b b' b' carried by its shaft.
The circuit connections are established between the rings on the generator shaft and those on the motor shaft by collecting brushes and wires as previously explained. In order to properly energize the field magnet of the motor, however, the connections are so made with the armature coils by wires leading thereto that while the points of greatest attraction or greatest density of magnetic lines of force upon the armature are shifted in one direction, those upon the field magnet are made to progress in an opposite direction. In other respects the operation is
