92 ELECTRICAL MACHINERY 



them, and a wooden wedge fitting tightly into grooves 

 in the sides of the slot near the top, which serves to 

 hold the winding in place and prevent it throwing out 

 as the armature revolves. On small machines no wooden 

 wedge is used; after the coil sides have been hammered 

 snugly into place, a strip of stiff, insulating material is 

 slipped into the top of the slot and then binding wires 

 are wound around the armature periphery. Several bands 



FIG. 52. Showing Binding Wires, Around a Completed Armature. 

 Ventilating ducts may be seen also. Crocker-Wheeler Co. 



of such binding wire are generally used, as shown by Fig. 

 52, which represents the armature of a small c-c. generator. 

 As the coils are being placed on the armature each end 

 is made fast to its proper commutator bar and, when all 

 the coils have been put in the slots, the end connections 

 are hammered snugly into their proper places. They are 

 then soldered to the commutator bars and the armature is 

 completed. 



