Each section should be wound in the same direction as the others. The ends of the wires should be scraped free from insulation and connected together as follows: Connect the outside end of one section to the inside end of the next section. We will presume that the three sections of the armature are lettered "A, B, and C." Connect the outside end of "A" to the inside of "B"; the outside of "B" to the inside end of "C" and the outside of "C" to the inside of "A."
Those portions of the wire forming the connections between the three sections, are used to form the commutator segments, in the same manner as the ends of the wires in the case of the two-pole armature, only in this instance there are three sections to the armature.
FIG. 23.—Diagram showing how the coils are connected together so as to form a continuous winding.
Bend the wires so that they will fit closely to the paper core and bind them tightly into position with some silk thread. A section of the commutator should come opposite the space between each section of the armature.
The Field Magnet is exactly like that used in making the Simplex motor with the two-pole armature. It is made by first cutting out a strip of tin five-eighths of an inch wide by five inches long and then bending it into the shape shown in Figures 10 and 11. The easiest way of doing this with reasonable accuracy is to cut out a piece of wood for a form and then bend the tin over the form.
Two small holes should be bored in the feet of the field magnet so as to enable the field to be fastened to the base.
The field is wound with the same size of wire used on the armature. The winding is started by looping a small piece of tape or cord over the frame at the point indicated by "A" in Figure 15. The next two turns are then wound over the ends of the loop so as to hold them down. Wind on three layers of wire on one side and then run the wire across to the other side and wind on three layers there. The third layer of wire in the second coil should end at B. It should be fastened in position by a loop of string so that it will not unwind.
This method divides the field winding into two parts, both of which are connected together. The outside layer of the first coil is connected to the inside layer of the second coil. The two coils really form one continuous winding divided into two parts. The illustration in Figure 23 should make this clear. After the winding is finished, give it a coat of shellac.
The Bearings are shown in detail in Figure 12. They are easily made. Care should be taken to make the bearings very accurate so that the armature will be in the proper position when the motor is assembled.