44 ELECTRICAL MACHINERY 



inside of the armature core. The armature punchings 

 general^ have dovetailed slots punched on their inside 

 edge in such a fashion that when the core is assembled 

 they line up with one another and form a set of dovetailed 



FIG. 19. Assembled Armature Core for Large c-c. Machine. 



slots in the inside surface of the armature core, into which 

 the keys in the spider fit. 



In assembling such an armature the spider fitted with 

 keys on the lugs is laid horizontal on the shop floor. Then 

 the laminations, one at a time, are slipped over these keys 



