it is nil, the latter coil being in its neutral position. The poles of the ring R in Figure 3a will in consequence, be shifted to a position ninety degrees from that at the start as shown. The conditions existing at each successive eighth of one revolution are in like manner shown in the remaining Figures. A short reference to these Figures will suffice to an understanding of their significance. Figures 4 and 4a illustrate the conditions which exist when the generator armature has completed three-eighths of revolution. Here both coils are generating current, but the coil B' having now entered the opposite field is generating a current in the opposite direction, having the opposite magnetizing effect . Hence, the resultant poles will be on the line N S as shown.
In Figure 5 and 5a one half of one revolution has been completed with a corresponding movement of the polar line of the motor. In this phase coil B is in its neutral position while coil B' is generating its maximum current; the current being in the same direction as in Figure 4.
In Figure 6 the armature has completed five-eighths of a revolution. In this position coil B' develops less powerful current, but in the same direction as before. The coil B on the other hand, having entered a field of opposite polarity, generates a current of opposite direction. The resultant poles will therefore be on the line N S Figure 6a, or in other words, the poles of the ring will be shifted along five-eighths of its periphery.
Figures 7 and 7a in the same manner illustrate
