PAPERS OX CHEMISTRY AND PHYSICS 



333 



netic field was produced by an electric current flowing 

 through a solenoid on the outside of the chamber. The 

 electrons were obtained from a microscopic spot of oxide 

 deposited on a platinum strip. ^ TVhen the magnetic field 

 was on. and the electrons were projected at an angle with 

 the axis of the tube, they were twisted into a spiral 



JfOy.DC 



— \ ^^n) — 



ilo V.D.C. Joienoid Circuit 



[Nfhirf/irr CiKuit 

 ZoMu 



Pig. 1. General Arrangement of Apparatus. 



^which struck on a photographic plate at the opposite end 

 of the discharge chamber. 



The radiation used in the experiment was admitted 

 just in front of the cathode through a side tube with a 

 quartz window and thrown directly across the path of 



1. C. J. Lapp; Trans. HI. Acad. Sci., V. 14, p. 305. 



