IIIF IM ron 18 



- of a revolution, then the rate of cutting lines of force is 



iiiv will therefore be an induced tension at the ends 



of each conductor equal to ' c.g.s units of tension, or 



di 



11 10'* volts, so that if each conductor were separate from 

 all the other conductors, we should observe a reading 



of ' I" ' volts on a volt in nected to the ends of 



tit 



any one conductor, tin depending upon the position of the 

 conductor. 



In practice, if the liru-hes are placed at the neutral 

 points abj each conductor is in series with all tin- <>tli-r 

 conductors round one side of the armature between the 

 brushes, so that the effect is as if we had one long conductor 

 .utting lines at different rates along its length; the total 

 number of lines cut by this imaginary long conductor in 



tit seconds is represented by the whole area of the curve ; 



i 

 hence the whole tension induced is " 10"* volts. 



It' the armature is rotating uniformly at n revo- 

 lutions per second, // = ' ; hence the tension induced 



. I 



in all the conductors in series between the neutral jx.int - 

 ami ol.-i-rv. <I on a voltmeter connected by brushes to these 

 points, will be given by the equation 



0.4ft.Y10- v volt* ... .,7). 



If the dynamo has more than two poles, and if the 

 conductors between two adjacent neutral points are placed 

 in series with theae between two other neutral por 



