of Radiation by Electron Imparls in Helium. 

 Fig-. 5. ;; = 8-0 mm. ; J, = Q-8o (10) " ,; amp. 



563 



280 



240 



200 



f 160 



* E 



""120 



80 



40 













































































































































































i L 



(3 



















































1 









J 































1 

































// 

































7 





































































JR^ 





i 



p ___ 













> ■ •* 



„ 



*^A 





























22 24 26 28 30 32 34 



Va (Volts) 



R 

 1.40 



1.20 



1.00 



Table I, 





c=0-50. 





p (mm.). 



R. 



i/r. 



0-0005 



1-90 



0055 



0001 



1-81 



0416 



o-oo:f 



1-74 



0-17*. 



0012 



1-60 



0383 



015 



1-57 



0-378 



0044 



1-55 



0-410 



0-17 



1-40 



075 



100 



110 



222 



8-00 



1-07 



63 



25-00 



104 



114 



The effect between 20*2 and 25'5 volts apparently ap- 

 proaches one of pure radiation as the pressure is reduced. 

 It seems obvious, therefore, that this effect must be one of 

 pure radiation at any pressure. For in an atomic catastrophe 

 so intimately related to the inner structure of the atom it is 



