Jack — Magnetic Resolution of the Spectrum Lines of Niobium . 57 

 Table X. 





2697-20 



n 



2698-99 



" 



2702-65 



n 



2764-67 



" 



2765-40 



n 



2773-32 



n 



2826-1 



n 



2829-86 



n 



2835-22 



n 



2843-75 



n 



- 0-132 

 



+ 0-111 



- 0-135 

 



+ 0-103 



'- 0-129 





 \ + 0-109 



- 0-202 

 



+ 0-111 



- 0-190 

 



+ 0-179 



- 0-177 

 



t 0-145 



- 0-146 

 



+ 0-098 



f- 0-159 

 [ + 0-111 



-0-179 





 + 0-157 



-0-167 





 + 0-152- 



- 0-155 

 



+ 0-142 



Remarks 



15 

 15 

 15) 



o .2 ? 



7"^ I 



- 0-174 

 



+ 0-110 



-0-149 





 + 0-104 



- 0-190 

 



+ 0-168 



1 - 0-144 

 (+ 0-131 

 ( - 0-141 

 ( + 0-125 

 (-0-171 

 ( + 0-162 

 (-0112 

 ( + 0-195 



Eemaika 



Minimum intensity 

 of mid. compt. 



f This is a quadruplet, and appears on 

 plates giving all components as if 

 I the parallel doublet had moved to- 

 { wards violet and then there resulted 

 I an overlapping of the violet com- 

 I ponents of the parallel and perpen- 

 l^ dicular doublets. 



(- 0-296 

 ( + 0-26L 



-0-180 





 + 0-236 



As niobium occupies the same position in the fifth column of Mendelejeff's 

 table as molybdenum does in the sixth, these substances resemble each other 

 in many properties, chemical and physical. Hence it is very probable that 

 this resemblance may also extend itself to their -spectra and Zeeman Effect. 

 It is, therefore, of importance to examine for points of similarity and 

 dissimilarity. Like molybdemtm, and also tungsten, the spectrum contains 

 many lines. It might be expected from the positions in the periodic system 

 that the resemblance would be greater to the former than the latter. This is 



K.I. A. PROC, VOL. XXX., SECT. A. 



[9] 



