THE ALTERNATOR. 



current generator called the exciter. The field windings, BB y 

 Fig. i, of an alternator are arranged exactly like the field wind- 

 ings of a direct-current dynamo. 



To receiving 



r 



circuit 



Fig- 3. 



It is the relative motion, only, of armature and field magnet 

 which is essential in any dynamo, and alternators are frequently 

 made with a revolving field magnet, the outwardly projecting poles 

 of which ^VSTVS, Fig. 4, sweep past the stationary armature 



Fig. 4. 



