PARTS OF A DYNAMO-ELECTRIC MACHINE 45 



all the way around; when a complete ring of laminations 

 has been placed, the next layer of laminations is put on 

 in a similar manner, but so placed that the two rings 

 ''break joints," i.e., the joints between plates in the adjacent 

 layers do not come opposite one another. 



FIG. 20. Assembled Armature Core for Large a-c. Machine. West- 

 inghouse Elec. and Mfg. Co. 



An armature core, assembled on its spider and fitted 

 with shaft is shown in Fig. 19. This core is used in 

 the construction of a large multipolar continuous current 

 machine. The assembled armature core for a large alter- 

 nating current generator is shown in Fig. 20. This armature 

 is designed to be stationary; the field frame of the machine 



