154 



0. C. Lester — Oxygen Absorption Bands. 



n/ 



I 2 3 f S i 7 9 9 /c if it (3 



The &n-curve for sec. series, sec. band, Group B. 



The carve, in form, is very nearly an equilateral hyperbola. 

 Assuming it to be such we have 



bn = k=z const. 



This, however, is not quite true, but if a correction is made as 

 follows, 



bn— — = k 



then Jc is almost exactly constant. 

 b in Deslandres' formula we have 



Substituting this value of 



N = a + toi + cri*. 



That is, the correction for Deslandres' law is of the first order 

 in n instead of being as usual of a higher order ; the constant 

 k is very large compared with c. Both c and h are different 

 for the different series but their variations are small. 



The increased accuracy of the new formula is shown by its 

 application to the same series of B calculated above by Des- 

 landres' law. The differences only are given here correspond- 

 ing to the third column above. 



o-oo 



+ 0-01 



k = 5-86 



+ 0-00 



— 0*04 



c = '2611 



+ 0-02 



— 0-07 





+ 0-05 



+ 0-01 





+ 000 



— 0-02 





+ 0-02 



— 0-05 





+ 0'01 



— 0-16 





