154 



ELEMENTS OF ELECTRICAL ENGINEERING. 



group, and the pair may be looked upon as a complete turn of 

 wire, or in other words, all the conductors shown in Fig. 101 

 may be looked upon as a magnetizing coil surrounding the line 

 CD as an axis. The magnetic action of this coil is the demag- 

 netizing action of the armature. 



Fig. 102 is like Fig. 101 except that it shows only those 

 armature conductors which lie at a greater angular distance than 



Fig. 102. 



a from the line AB. Each of the conductors on the right 

 in Fig. 1 02 may be thought of as paired with a conductor on the 

 left, and the pair may be looked upon as a complete turn of wire, 

 or in other words, all the conductors shown in Fig. 102 may be 

 looked upon as a magnetizing coil surrounding the line AB 

 (Fig. 100) as an axis. The magnetizing action of this coil is the 

 cross-magnetizing action of the armature. 



The state of affairs shown in Figs. 100, 101 and 102 obtains 

 in a generator, as may be seen by applying the rule which corre- 

 lates direction of a current in a wire, direction of field in which 

 the wire is placed, and direction of side-push on the wire. Fur- 

 thermore, the demagnetizing action of the conductors shown in Fig. 

 101 is positive, that is, it is a genuine demagnetizing action which 

 opposes the passage of the flux 3> through the armature, as may 



