PLATE 1. 



Mounting of Braun Tube. 



Spectrum of Gap 



with 



Aluminum Comparison. 



Spectrum. 



d. 



A.2 = 118 meters. 

 Ag = 236 meters. 

 Ratio =1:2. 

 /. C. F. = 4. 



c. 



Ig = .73 ampere. 

 A2 = 110 meters. 

 I. C. F. = 5. 



= 76 meters. 



= 114 meters. 

 Ratio = 2:3. 

 /. C. F. = 4. 



^2 



^3 



