THE PATH OF A RIGID ELECTRON WHICH MOVES IN 
A MAGNETIC FIELD OF CONSTANT STRENGTH 
ROTATING WITH CONSTANT ANGULAR 
VELOCITY 
E. 0. HULBURT 
Abstract 
Equations of motion of a rigid electron in a uniformly rotating 
magnetic field of constant strength rotating with a frequency 
o)/2tt in the XZ plane are obtained. The reactions on the motion 
due to finite size, radiation from the electron and the field, and the 
variation of mass with velocity are neglected. If initially the 
velocity of the electron has components only along the X-axis or 
the Z-axis the path of the electron is a wavy curve inside an an- 
nular space whose axis is parallel to the Y-axis. If the initial 
velocity of the electron has components only along the Y-axis the 
path is a rather complicated type of spiral winding in the general 
direction of the Y-axis. It is found that a high frequency of ro- 
tation of the magnetic field, of the order of 10 6 , such as may be 
produced by electron tube circuits, would not impart a great 
velocity to the electron. 
State University oe Iowa. 
PHENOMENA IN GASES EXCITED BY RADIO FRE- 
QUENCY CURRENTS 
E. O. HULBURT 
Abstract 
The spectra from hydrogen, oxygen and air excited by currents 
of the frequency of the order of 10 6 alternations per second pro- 
duced by an oscillating fifty-watt electron tube were photographed 
with a grating spectrograph in the spectral region from 5000 A 
to 3500 A. These spectra were found to be identical with the 
spectra of the same gas stimulated by sixty-cycle current of the 
same strength as the radio frequency current. 
The potentials just sufficient to set up luminosity in hydrogen 
and in oxygen were measured for direct and radio frequency, i.e., 
