Radiation in a Magnetic Field. 



115 



as the increased velocity occurs only in the equatorial plane, 

 the broadening would be observed chiefly in this plane *. 



Fig. 7. 



Fisr. 8. 



According to Zeeman the only effect of the magnetic field 

 is to broaden the spectral lines, and the theoretical investiga- 

 tion fails to account for the doubling which has been observed 

 in almost every case thus far examined. 



* It is worth noting that in almost every instance the magnetic field 

 caused a perceptible increase in brightness. 



12 



