258 Mr. G. A . Hemsalech : Excitation of Spectra of Carbon, 



therefore not emitted at so low a temperature as iron lines. 

 This fact is indeed quite in harmony with M. de Watte ville's 

 and my observations regarding the flame spectra of these 

 elements. In the mantle of the air-coal gas flame the iron lines 

 are well developed, whereas no trace of H and K is- seen. 

 But the latter are quite intense in the oxy-coal gas flame at 

 2400° C. It would therefore seem that also in the present 

 case the H and K radiations are caused principally by thermo- 

 chemical excitation, and they do not appear to be appreciably 

 affected by the thermelectronic current. 



The following tables contain all the lines and bands of the 

 spectrum of the red fringe, but only those of the luminous 

 vapour which were observed by me likewise in a carbon tube 

 resistance-furnace. Lines to which an asterisk is affixed 

 are marked on the plates to the nearest Angstrom unit. 









Titanium. 











Relative 



intensities. 





Relative 



intensities. 



A 





r 





^ 









~> 



*. 



Red fringe. 



Arc. 



Spark. 



X 



Red fringe 



Arc. 



Spark. 



3635-47 



000 



15 



3 



4078-47 



000 



8 



4 



3642-68 



000 



15 



3 



4301-08 



1 



15 



3 



3653-49 



00 



15 



4 



4305-91 



1 



20 



8 



3671-66 



000 



4 



3 



4314-80 



000 



5 



3 



3689-89 



000 



3 



2 



4393-93 



00 



5 



2 



3717-39 



000 



5 



2 



4512-74 



00 



15 



4 



3729-77 



1 



8 



4 



4518-03 



00 



15 



4 



*3741- 14 



1 



15 



2 



4522-80 



00 



15 



4 



*3752-87 



1 



15 



5 



4527-31 



00 



15 



4 



3753-63 

 *3771-64 



00 



JL 



3 

 4 



3 

 3 



* 45 33-25 



* D 34-78 



1 



20 

 15 



5 

 4 



3900-53 



00 



5 



50 



„ 4 35-92 







8 



3 



3904-77 







10 



5 



.M6-00 





20 



4 



3924-52 



1 



8 



3 



4544-70 







10 



3 



3929-87 



1 



8 



3 



4548-77 



00 



8 



3 



3947-75 



1 



10 



3 



4656-47 







8 



3 



3948-66 



14 



12 



4 



4667-59 







10 



5 



3956-28 



14 



15 



4 



4681-91 







20 



10 



395821 



2 



15 



5 



4991-08 



1 



20 



10 



3962-86 







8 



3 



4999-51 



1 



20 



10 



3964-27 



J_ 



8 



3 



5007-22 



1 



2 



20 



10 



*3981-77 



1 



15 



3 



*5014 26 



1 



20 



8 



3982-54 







8 



3 



5039-96 



1 



10 



3 



*3989-77 







20 



6 



5064-66 



1 



10 



4 



*3998-85 







20 



6 



5173-74 







15 



5 



*4009-14 



1 



8 



4 



519297 







20 



8 



400968 



000 



4 



2 



*52l0-39 



1 



20 



10 



*4024-57 



1 



2 



10 



3 











