164 



Mr. H. Eamage. Abnormal Changes in [Nov. 19, 



" Abnormal Changes in some Lines in the Spectrum of Lithium.'' 

 By Hugh Eamage, B.A., St. John's College, Cambridge. 

 Communicated by Professor G. D. Liveing, F.E.S. Received 

 November 19, — Eead December 11, 1902. 



In the course of an investigation on the flame spectra of metals, the 

 writer has examined the spectrum of lithium. Some facts have been 

 discovered of sufficient importance for a separate paper. 



The same spectrometer was used as in the investigation on the 

 " Spectra of Potassium, &c."* Whilst the wave-lengths of some of 

 the lines in the flame spectrum of lithium agree closely with those 

 given by Kayser and Eunge for the lines in the arc spectrum,! the 

 wave-lengths of other lines differ considerably from these. The num- 

 bers and differences are given in the following table : — 



Oxy hydrogen 

 flame spectrum 

 (Author). 



Arc spectrum (Kayser and Eunge). 



Principal series. 



Second subordinate 

 series. 



First subordinate 

 series. 



Wave- 

 length. 



Inten- 

 sity. 



Wave- 

 length. 



Differ- 

 ence 

 from 

 flame. 



Wave- 

 length. 



Differ- 

 ence 

 from 

 flame. 



Wave- 

 length. 



Differ- 

 ence 

 from 



flame. 



6708 



10 



6708 '2 













6103 -84 



9 











6103 -77 



-0-07 



4971 -98 



2 







4972-11 



+ 0-13 







4603 -07 



7 . 











4602 -37 



-0-70 



4273 -34 



1 







4273 -44 



+ 0-10 







4132 -93 



5 











4132 -44 



-0-49 



3985 -86 



<1 







3985 -94 



+ 0-08 







3915 59 



3 











3915 -2 



-0-39 



3795-18 



2 











3794-9 



-0-28 



3719 



1 * 











3718 -9 





3232 '82 



4 



3232 77 



-0-05 











2741 43 



1 



2741 -39 



-0-04 











The flame lines are all sharp. 



Kayser and Runge describe the lines 6708 2. 3232*77, 2741*39, and 610377 as 

 "mostly reversed"; the lines in the second subordinate series as diffuse towards 

 the red ; the lines 4602 - 37 and 413244 as reversed ; and the latter, with the 

 remaining lines in the same, series as diffuse on both sides. 



* ' Roy. Soc. Proc.,' vol. 70 (1902), p. 303. 



f ' Berlin Akad. Abhandl.' (1890), vol. 4, p. 19. 



