206 



Sir Norman Lockyer and Mr. F. E. Baxandall. 



Four of these may be present in the Kensington photograph, being 

 probably hidden by lines of Ag and Ca. With regard to the others, 

 reference to unpublished lists of lines in the arc spectra of many other 

 elements suggests no origin which can be assigned to them. 



In addition to these lines, Hasselberg has apparently observed as 

 double the following lines recorded as single in the other two lists. 



Lines recorded as Double by Hasselberg. 



Hasselberg. 



Kensing 



ton. 



Rowland. 





X. 



Int. 

 Max. 



4-5 



X. 



Int. 

 Max. 

 10. 



X. 



Int. 

 Max. 

 15. 



Rei narks. 



3931 -40 

 3931 • 50 



1} 



3931 -46 



5 









4423 32 

 4423 -41 



ill 



4423-40 



4 



4423 37 



8 





4619 -85 

 4619 '97 



2 \ 



2-3) 



4619 -92 



7-8 



4619 -90 



0* 



*?(10). 



4757-55 

 4757-68 



2 \ 

 2-3] 



4757 '62 



5-6 



4757-69 



4 





4776 -54 

 4776 -70 



2 1 



3 1 



4776-63 



6 



4776 -64 



5 





In considering Rowland's list in relation to the two others, it is 

 found that the following lines are recorded by him only. Some of 



Lines given by Rowland only. 



Rowland. 



Remarks. 



Rowland. 



Beinarks. 



1 



Rowland. 



1 



• 



Remarks. 



A. 



Int. 

 Max. 

 15. 



A. 



I 



Int. 

 Max. 

 15. 



i X. 



Int. 

 Max. 

 15. 



3919 -60 



1 





! 4456-07 



1 



Ca. 



4823 -03 



1 





3933 -77 



3 



Ca(K). 



4458-91 



1 





4829 -43 



1 





3944 -13 



3 



Al. 



4460 -85 



4 





4834-26 



1 





3961 -65 



5 



Al. 



4470 -87 



1 





4835-04 



1 





3968 -59 



1 



Ca(H). 



4552 -73* 



5 





4849 -26 



1 





4033 -19 



3 



Mn. 



4608 -63 



1 





4849 -46 



1 



- 



4034-62 



2 



Mn. 



| 4613 -98 



1 





4852-15 



1 





4057 -96 



1 



Pb. 



i 4663-31 



3 





4854-11 



1 





4077 '85 



1 



Sr. 



1 4708-40 



1 





4855 -55 



1 





4183 07 



4 





I 4709-13 



1 





4870 -33 



1 





4226 -87 



4 



Ca. 



4769-21 



1 





4873-17 



1 





4318 -80 



2 



Ca. 



4781 -51 



1 





4907 -05 



1 





4397 -39 



1 





4789 -10 



1 





4913-28 



1 





4425 -59 



1 



Ca. 



4794 -73 



1 





4919-17 



1 





4454 -94 



1 



Ca. 



4802 -37 



1 











* Possibly misprint for 4553 *27. If so, should not ajmear in this list. 



