Low Frequency and their Resonance. 



517 



One-half of the bundle of the iron wire was placed into the 

 inertia coil and the circuit tuned. Table III, Part A, gives 

 the data from which curve I, fig. 6, was plotted. Next all the 

 wire was placed into the inertia coil and the circuit tuned. 

 Table III, Part B, gives the data from which curve II, fig. 6, 

 was plotted. Finally the circuit was tuned without any iron 

 and from the data of Part C, Table III, curve III, fig. 6 was 

 plotted. 



From the curves I and II it is evident that the doubling of 

 the mass of iron produced very little change in the values of 

 the capacity and self-induction which established resonance 

 between the circuit and the impressed e. in. f., and yet 

 although the losses due to magnetic hysteresis were more than 

 doubled (since the magnetizing current was a little larger with 

 double the mass of iron in the inertia coil), yet the rise of 

 potential due to resonance was increased. This experiment 

 seemed to me to indicate that hysteresis and Foucault current 

 losses do not explain quite fully the discrepancy between the 

 theoretical and the experimental values of the rise of potential 



