Jack — Magnetic Resolution of the Spectrum Lines of NioMum. 55 



The final formulae olstained were 



X 



10^ 



= 39489-70 - 



90466-78 182310-86 



(1) 



= 3475842 - 



22126-18 43932-78 



(2) 



The Zeemau Effect and intensity corresponding to the calculated lines 

 are given where they have been observed. It will be seen that the intensities 

 do not show continuous diminution ; but, as has been pointed out, one must 

 not attach too much importance to the intensities. No lines have been 

 observed corresponding to further- calculated values. It might be the case 

 that these have disappeared through lack of intensity. 



A search has also been made for equal differences between the frequen- 

 cies corresponding to lines whose separation is approximately 1-17. Many 

 nearly equal differences have been found, but no scheme such as I obtained 

 for tungsten connecting these differences has been discovered. A few of these 

 differences (D) are given below. 



Table VIII. 



n 



D 



" 1 



n 



D 



n 



1 

 28-210-42 



22166-76 



569-93 

 d69'93 



27640-49 

 21596-83 

 30058-92 

 23704-10 

 32971-85 

 21596-83 



36266-57 

 30433-62 

 24389-94 

 36322-42 

 28210-42 



2223-20 

 2223-20 

 2223-18 



33556-82 

 28210-42 



31610-56 



1551-64 

 1551-62 



22166-76 



25255-72 



4711-86 

 4711-92 



31610-56 



36322-42 

 24947-43 



3350-57 

 3350 60 



27640-49 



Included among the triplets are a few of the type first observed liy 

 Becquerel and Deslandres, in which the outside components correspond to 

 |7-vibrations and the centre component to s-vibrations. . , , 



There are forty-sis lines which appear to be unseparated. These are 

 contained in Table IX, which also has had to be omitted. In general the line 

 on the ^J-plates is stronger than on the s-plates, though the time of exposure 

 was the same. In the case of the triplets, where all the components are on 

 the same plate, the 2>components never fall relatively to the s-eomponents 

 to the low minimum observed with other substances. This may be a peculiar 

 property of this element. 



