﻿Temperature on the Spectra of Incandescent Gases. 195 

 the results obtained, definite values for the magnitudes A A , A Xj , 

 =— may be inserted in the formula (3), 



Ea^ [1-(1-A a )-]J a 



4* [i-(i-A x /]Jx; 



and then the magnitudes ~ may be calculated for different 



values of cr. 



Let A A =0-100, 



A A , = 0-005. 



For immediately adjacent parts of the spectrum 



For distant parts (for example, for the hydrogen-lines C and F), 

 let 



h 



=0-25, 



and, for simplicity, let the above values of A A and A A/ be retained. 

 We thus find the following series for the ratio of brightness with 

 ascending values of a : — 





Ratio 



of brightness 



of adjacent parts, 



of a 





Ja i 





spectrum 





£ 



with different pre 



assures. 



<T. 









cr. 



1 



20-0 







1 



10 



13-3 







10 



20 



9-2 







20 



30 



6-8 







30 



40 



5-3 







40 



50 



4-5 







50 



60 



3-8 







60 



70 



3-4 







70 



80 



3-0 







80 



90 



2-7 







90 



100 



2-5 







100 



200 



1-6 







200 



300 



1-3 







300 



400 



1-2 







400 



500 



1-1 







500 



of distant parts, 

 J *=025. 



JA, 



E\ /ff 

 5-00 

 333 

 2'30 

 1-70 

 1-33 

 1-13 

 0-95 

 0-85 

 0-75 

 0-67 

 0-63 

 0-40 

 0-32 

 0-30 

 0-28 



02 



