Preliminary Tabic of Wave-lengths of Enhanced Lines. 457 



Chromium. 





Int. . 



Int. 





A. 



in 



in 



Eeniarks. 





spark. 



arc. 





403.8 -20 



2 









4242 -62 



3 



trace 





4262 -14 



2 



■8 





4284 *38 



1 







4558 '83 



4 



2 





4588 -38 



4 



1 





4592 -50 



trace 









4619-71 



1-2 



trace 





4634-25 



? 



1 



Intensity in spark difficult to determine owing to 









superposition of an air line. 



Copper. 



A. 



Lockyer. 



Int. 

 in 

 spark. 



Int. 



in 

 arc. 



A. 



Eder and 

 Yalenta. 



Int. 

 in 

 spark. 



Remarks. 



4545 -1* 

 4556 *10 



2 

 5 











4555 -94 



In 



Enhanced line of Fe at A 4556 "10. 



# Seen only in spectrum taken with 4-prism Steinlieil spectroscope. 



