200 
IOWA ACADEMY OF SCIENCE Vol. XXIY, 1917 
Such a circuit as this is also suggestive in connection with 
telephone engineering, where a large range of frequency must be 
considered, and would have direct bearing upon the construction 
of any instrument or circuit in which any factor, as for instance, 
the current or the impedance, was required to vary with the fre- 
quency according to some arbitrary law. But even though prac- 
tical applications may be remote it is hoped that attention has 
been called to phenomena which are at least curious, interesting 
and suggestive. 
The writer is indebted to Mr. W. G. Prottsman for valuable 
assistance in taking the data and making the computations. 
Physical Laboratory. 
The State University. 
& Uu 
ME&l 
