276 Measurement of large and small Alternating Currents. 



Table II. 

 Iron-ring Transformer. Secondary Load 10-ampere Balance. 



Primary current. 



Ratio =?. 



0365 amp. 



8-12 



- 00764 



9-28 



0-1205 



10-12 



0201 



11-48 



0-336 



12-28 



Table III. 

 Iron-ring Transformer. Secondary Load 100-ampere Balance. 



Primary current. 



Ratio h. 



10 



15-695 



1-5 



1567 



2-4 



15-67 



41 



15-73 



60 



15-69 



Similar measurements were then made with a 100-ampere 

 balance as secondary load. From Table III., which gives 

 some of the actually observed ratios, it will be seen that the 

 ratio of current transformation is practically constant. 



With almost the same arrangement of secondary circuit 



experiments were made to find to what extent the ratio ^ 



I| 

 was affected by change of frequency. Table IV. gives the 

 results of these and shows that the ratio is almost independent 

 of frequency through the range tried. 



