126 ELEMENTS OF ELECTRICITY AND MAGNETISM. 



Fig. 85 shows 1 6 wires in 16 slots. Figures 84^ and 85^ are 

 what are called developed diagrams which show how the wires 

 are connected to each other and how they are connected to two 



y 



n 



Fig. 84a- 



Fig. 85a. 



To receiving circuit 



Fig. 84b. 



Fig. 85b. 



insulated metal rings r and r 1 upon which two metal brushes 

 a and b rub, thus keeping the moving wires connected to an 

 outside receiving circuit. 



The laminated iron cylinder AA with its winding of wire is 

 called the armature of the alternator, the metal rings r and r' 

 are called collector rings. The field magnet of an alternator must 



