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BELL SYSTEM TECHNICAL JOURNAL 



made at various frequencies between 1.59- 10^ and 3.66-10*, the 

 curves of v\ vs. N agree only fairly with those of v vs. N; where vi 

 varies as the square root of N, v varies as the powers 0.42 and 0.45 

 for the two minima regularly appearing. 



Another instance of a crinkle in a curve of the second type aforesaid 

 — a curve in which the shift ot the bridge across the Lecher wires, 

 necessary to restore resonance in the circuit which includes the 

 ionization-condenser, is plotted against N or something varying with 



• 



10 12 14 16 18 20 22 



GAUSS 



Fig. 9^Illustrating variation of dielectric constant (curve with full circles) and 

 conductance (curve with hollow circles) of ionized gas in the neighborhood of a 

 natural frequency, here due to a constant magnetic field. (S. Benner; Naturwis- 

 senschaften.) 



N — has been published by Appleton and Chapman. It refers to 

 ionized air; the applied frequency is 3. 75- 10^ the value of iV is 1.62 •10^ 

 and these two stand to one another in substantially the relation of 

 equation (24). Yet other instances have been published by H. 

 Gutton, and these offer difficulties. 



Gutton in his later work (with ionized hydrogen at the low pressure 

 of 0.0004 mm. Hg) followed the method which I have just described, 

 measuring the shift y of the Lecher bridge required to restore resonance, 

 and the mean-square current P traversing the Lecher bridge at 



