78 



Mr. C. J. Lundstrom. 



with a small proportion of manganese, and the spectrum differed 

 very materially from the other spectra. I shall therefore describe it 

 separately. 



I now pass to the description of Bessemer spectra from Langs- 

 hyttan, Domnarfvet, Nykroppa, and Hagfors. These in general 

 have the same characteristics, and only in unimportant details do 

 they differ from each other. 



I. 



The Langshytte Spectrum. (Fig. 1, spectrum I.) 



The following table of wave-lengths shows the different aspects of 

 the twenty lines and bands that I observed at Langshyttan. In this 

 and the following table given under the column n the number of the 

 observations on which the value of \ is based,* and under the head- 

 ing of +A the presumable error. 



Every one of the n observations, 



«1, «2) #3? • • • • 



have been reduced by means of the interpolatiou curve to the wave- 

 lengths. 



\ 1? X 2) ^3? • • • • X w , 



x = Xi+X a +X 3 +.. .. +*» 



n 



If 8 X = \—\ lt 



82 — — X — Ao, 



and h n == X — \ n} 



and if S — £ x 2 + Z 2 2 + 4 2 -f + 



then + A is calculated from the formula 



+ A = +0-674 J 8 . 



V n{n— 1) 



In the fourth column the supposed origin of the lines and bands is 

 indicated. 



* In the description of the Langshytte spectrum, n = the sum of all observations 

 made on the particular bands indicated. 



In the table of the blue flame spectrum, n is the number of observations on the 

 respective bands during only that period when the blue flame appeared. 



