I UK IMI'(T1'N 



11 



entering the annature across th- cylinder nf radiu- 

 the surface of which the axes of the conductors are 

 supposed to be lying, a* shown in Fig. '2. The ends of 

 these vertical ordinates will fonn a curve, the shape 

 of which will dejiend upon the variation of tin- intensity 

 of magnetisation from point to point ruund the armature. 

 The curve will generally be (jiiite irr.-irular and follow no 

 definite Lw ; methods of obtaining it experimentally will 

 be given later on. We shall call .-uch a cur\ r e the 



Fin. 5 



magnetisation curve, and tin- points a. A. the neutral 

 ; these points will be a distance *r apart if the field 

 is symmetrical. 



The area of each element -t' the <-urve Ix-in^ the 

 |.r..dn.-r <>t th< itit.-n-ity at any point into the distance over 

 which the intensity maybe amumed to be constant, will 

 represent rfn, the nunil>er of HneH of force enteun-./ the 

 armature between two adjacent <-<>ndurton*. and the whole 

 area of the curve will represent X. the whole number of 



- of force entering the armature from one pole. 



