Flame Spectra observed at Swedish Bessemer Works. 95 



J 6257 \ 



\ 6225 J 



/ 5895 1 



I 5889 J 



J 5580 \ 



\ 5569 J 



J 5536 \ 



1 5518 J 



5536 

 5518 

 5417 



5374 

 5343 



3-1 



1-2 



0*9 



1-3 

 1-4 



Li 

 CaO 



CaO 



Notes. 



J Band with its sharpest edge towards 

 1 the red. 



J Sharp band, shading away towards 

 X the red. 



J Sharp band, shading away towards 

 X the violet. 

 Faint line. 



f Two strong lines, or possibly narrow 

 < bands shading away towards the 

 |_ red. 



C o mparison Spectra . 



The origin of the chief portion in the Ulfshytfce spectrum, I have 

 been unable to ascertain. Though several lines and bands of ele- 

 ments that might be supposed to form that spectrum correspond 

 with it to some extent, yet one cannot state positively that there is 

 any connection between these spectra and the Ulfshytte spectrum.* 



Notwithstanding the small percentage of manganese in the metal 

 used at these works there is no doubt that the" most important of the 

 manganese-oxide bands are to be found. The most brilliant of them, 

 /3, and /3 2 , certainly show to some degree an appearance differing 

 from that in the spectra mentioned above, a dark band separating 

 them, and near to ft, the Ulfshytte spectrum shades away more to 

 the violet than to the red, but this is only due to a band oE another 

 element situated almost in the same place. The fact ' that two of 

 these MnjjOs bands are marked in the Ulfshytfce spectrum as lines, 

 only signifies that they are more sharply defined in this spectrum. 

 I presume this is due to the small proportion of manganese in the 

 metal and to the high temperature of the " blow " at these works. 



Presuming that the phosphorus-spectrum, described on page 87, 

 could under favourable circumstances show sharply defined bands so 

 that they more resemble lines situated where the maxima of light of 

 the present bands are to be found, we have a plausible explanation of 

 the lines 5258 and 5099, and possibly of the appearance of the band 



* I have studied the following works especially for this purpose of obtaining an 

 explanation of the spectra herein described, namely : Kayser's ' Spectrum Analysis;' 

 Thalen, ' Memoire sur la Determination des Longueurs d'Onde des RaiesMetalliques/ 

 Upsal, 1868 ; Angstrom et Thalen, ' Recherches sur les Spectres des MetaUoides,' 

 TJpsal, 1875 ; Lecoq de Boisbaudran, ' Spectres Lumineux,' Paris, 1874 ; and Salet, 



Spectres des MetaUoides " (' Annales de Chim. et de Physique,' vol. 4, TsTo. 28. 

 Paris, 1873). 



