Flame Spectra observed at Swedish Bessemer Works. 85 



The Bessemer Spectrum as observed at Langshyttan. 



A. 





6252 1 





6208 





6176 





5855 



ft 



5608 



> P> 



5581 



\ A 



5426 i 



73 



5389—87 



> * 



5353 





5264 -i 





5227 





5189 





5160 J 





5103 





50-43 





5002 





To ascertain the origin of this spectrum 

 it was compared with that obtained 

 from manganese compounds, from 

 which the following measurements 

 >> were taken :— 6252, 6202, 6187, 6143, 

 5888, 5859, 5808, 5757, 5710, 5672, 

 5610, 5581, 5425, 5388, 5359, 5267, 

 5228, 5193, 5151, 5129, 5092, 504S, 

 5004, 4969, 4921, 4820. 



The most distinctly defined edge of each band was measured, and 

 this lay on the side towards the violet. 



The band y 3 = 5264 of my Langshytte spectrum occurs in all the 

 spectra of Lecoq. I have found it not only in the spectrum men- 

 tioned above, produced by means of the flame of detonating gas, but 

 also in a manganese oxide spectrum, which was obtained at the 

 mining school at Filipstad by passing pure manganous chloride into 

 the flame of a gasoline lamp. It is surprising that Watts has not 

 pointed out this band, or found that it agrees with the line 5269 in 

 his Bessemer spectrum. 



It is true that this band, by comparison with other bands of the 

 c group, seems a little fainter in the Mn 2 3 spectrum than in the 

 Bessemer spectrum, and that one may therefore suppose that some 

 line of another element is present in the same place, but I am not 

 able to agree with Watts in assigning this line to iron, on account of 

 the few concordant iron lines. 



« 3 (\ = 6252) fully agrees with my Mn 2 3 spectrum, and with that 

 of Lecoq, but not with that of Watts. 



But, on the other hand, there is in the Langshytte spectrum a 

 narrow line (6176) which corresponds to 6178 in Watts' Mn a 3 

 spectrum, but which does not agree with the bands observed by Lecoq 

 and myself. It is, however, very difficult to decide how the matter 

 really stands, but most likely it is owing to the well-known fact 

 that Mn 2 3 changes its aspect according to conditions of tempe- 

 rature under which it is produced, several bands which are visible 

 at first fade away, while others which at first are obscure grow more 



