Currents hy means of the u Pliaseograpli 



977 



Strength oJ 



' current. 



Deviation. 









1. 





2. 



100. 



10 " 3 amp. 



1 77 







90 





161 





2-49 



80 





1-45 





2-71 



70 





1-28 





2-93 



60 





MO 





3-15 



50 





0-94 





3-37 



40 





0-7(5 





3-60 



30 





0-58 





3-83 









o-oo 





4-48 



7 is noted when one measuring-wire only was used, 2 when 

 the same current passed through both the wires. In the 

 subjoined graphical diagram the direction of 2 is reversed. 



Fij 



The diagram shows that there is proportionality between 

 deviation and strength of current. 



If the instrument is used for registering characteristics, the 

 method is obvious : we have merely to shunt part of the 

 current off to one measuring wire, while through the other 

 a current is passed that is proportional to the examined voltage 

 Later on I will give complete coupling-diagrams for this use 

 of the apparatus. 



Another way is to compare two alternate currents with 

 each other,/, i. strength of current and voltage in transformers, 

 phase-differences between current and tension by self-induction 



