one of soft iron, for the reason that the former is assumed to possess a greater resistance to the shifting of the magnetic lines.
In illustration of other forms of apparatus by means of which this invention may be carried out, reference is now made to the remaining figures of the drawings.
Figure 10 is a view in elevation and part vertical section of a motor. Figure 12 is a top view of the same with the field in section and exhibiting a diagram of the connections. Figure 11 is an end or side view of the generator with the fields in section. This form of motor may be used in place of that described.
D is a cylindrical or drum armature core, which for obvious reasons should be split up as far as practicable to prevent the circulation within it of currents of induction. The core is wound longitudinally with two coils E E', the ends of which are respectively connected to insulated contact rings d d d' d' carried by the shaft a upon which the armature is mounted.
The armature is arranged to revolve within an iron shell R which constitutes the field magnet or other element of the motor. This shell is preferably formed with a slot or opening r, but it may be cortinuous as shown by the dotted lines, and in this event it is preferably made of steel. It is also desirable that this shell should be divided up similarly to the armature and for similar reasons.
The generator for driving this motor may be such as that shown in figure 11. This represents an annular
