51 I 



PROCEEDINGS OF THE AMI-KUAN ACADEMY. 



At fir t I studied the effect of increasing the Belf-induction on the 

 admittance of the mixture of anode and cathode raya to the region C. 



B 



R 



Fioi i.i l. 



The phosphorescence on the screen at the end of the tube was ob- 

 erved with a spectrophotometer, and also with a photometer consisting 



of crossed nichol prisms. 



In Figure 2 the intensity of light is plotted along the axis of Y. 

 and the wave lengths of the circuit along X. The phosphorescence 



70 

 GO 

 50 

 40 

 30 

 20 

 10 



mms 





-100 



500 



I i .i i.i 2. 



600 



appeared Buddenly at wave length 380 meters, and increased to a 

 maximum at wave length 620. The curve then continued parallel to 



the axis of X. In determining the wave lengths I employed the ad- 



