478 Piipin — Resonance Analysis of Alternating Currents. 



primary current when the secondary current increases. The 

 following experiments seem to answer this question definitely : 

 The arrangement of circuits was that given in fig. l b . The 

 secondary circuit of the large 5 K. W. transformer contained 

 an electrolyte resistance and the secondary current was meas- 

 ured by means of a Siemens electro-dynamo-meter. For every 

 particular value of the secondary current the resonant rises of 

 potential due to the harmonic and the fundamental were care- 

 fully determined by means of the multicellular voltmeter. 

 Table Y contains the observations relating to the harmonic of 

 three times the frequency of the fundamental ; Table YI 

 relates to the fundamental (130 P. P. S.) The apparatus 

 employed were the large alternator and the 5 K. W. trans- 

 former. 









Table V. 





Secondary 



current in amperes. 



Resonant rise of the harmonic 

 in volts. 













65 





3'6 







65 





4-8 







66 





6-9 







68 





8-5 







70 





11-5 







76 





15-7 







85 





20 







97 





28 







120 





40 







162-5 





56 





Table VI. 



202 



Secondary 



current in 



amperes. 



Resonant rise of 

 the fundamental 

 in volts. 

 (Observed.) 



Resonant rise of 

 Auxiliary resistance the fundamental 

 in the resonator in in volts, 

 ohms. (Calculated.) 









80 







80 



3-6 





240 







240 



5-0 





122 



50 



503 



6-7 





150 



50 



613 



9-0 





200 



50 



825 



17-3 





200 



100 



1,450 



27-0 





185 



210 



2,613 



44'0 





155 



410 



4,127 



56-0 





160 



510 



5,100 



Table YI requires explanation. When the secondary cur- 

 rent was over 3'6 amperes the resonant rise of the fundamental 

 was too high for the voltmeter employed and also too risky for 

 the condenser. An auxiliary resistance had to be introduced 

 into the resonator to bring the resonant rise down to the limits 



