88 ELECTRICAL MACHINERY 



Insulation of Armature Windings. After the wire coil 

 is taken from the wooden form, it is taped tightly with 

 insulating tape, the ends are cut to the proper length for 

 connecting to the commutator and are properly bent so 

 that when placed on the armature the front pitch will be 



FIG. 48. Typical Coils Used for a Wave Winding. Note the form of 

 the front connections, as contrasted to those of the coils shown 

 in Fig. 47. Allis-Chalmers Co. 



the desired amount. The amount of insulation put on these 

 formed coils before they are ready for use on the armature 

 depends upon the voltage for which the winding is designed. 

 In a high voltage machine several layers of cotton tape 

 and oiled cambric are bound tightly around the coil and 



