FARM MOTORS 



coil, the coil will tend to rotate. This is the principle of 

 the electric motor: instead of taking a current off of the 

 armature, one is put into it and at the same time sent 

 through the fields- The current passing through the 



FIG. 367 MULTI POLAR MOTOR 



fields induces magnetism in them; the lines of force pro- 

 duced by this magnetism draw on the armature and cause 

 it to revolve. By studying Fig. 356 it will be noticed 

 that the coil will revolve until the plane of the coil 

 is parallel to the lines of force, and then stop. This same 

 condition would take place in the motor if it were not for 

 the commutator. Just at the instant the coil is brought 

 to the position to stop, the commutator changes the di- 



