100 Origin of Lines and Bands in Spectra from Bessemer Works. 



Railway cannot with certainty be assigned to any particular element. 

 The following are some of the lines and bands referred to : — 



Spectrum of the 

 " blue flame." 



A. A. Eemarks. 



5709 is probably 5712 Mn. 



5451 „ 5456 Mn. 5452 Crewe, 



5339 „ 5338 Mn. 



4986 „ 4983-5 ffa. 



4854 „ 4853 Mn from Mn0 2 . 



4809 „ 4808-2 Crewe spectrum. Li? 



4748 „ 4749-5 Mn. 



4655 „ 4656 Mn. 



4540 „ 4540 Crewe spectrum. Fe. 



4492 „ 4493 Crewe spectrum. Fe. 



Certain lines or bands in the spectrum of the " blue flame " were 

 found to coincide with, or closely approximate some of the principal 

 bands measured by Salet in the spectrum of silicon, namely, 567, 

 545, 522, 501, and 487"5. 



A measurement corresponding to the first of these, described as 

 5672, edge of band intense, was observed by me on plate 8, Crewe, in 

 the first spectrum only ; another measurement of the same band on 

 plate 6, Crewe, gave 5670. The origin of this band I have been 

 unable to ascertain. 



Of the remaining lines in the " blue flame " : — 



A. A. Eemarks. 



545 is probably 5445 Mn. Two lines, 5455 and 5452, in the Crewe 



spectrum approximate to 5454" 7, which, 

 according to Fievez and Thalen, is Fe. 



522 ,, 5227 Mn 2 3 . Lundstrom. Other lines correspond- 



ing to this are 5231 Crewe, 3rd spectrum, 

 plate 6, and 5217 Crewe, 3rd spectrum, 

 plate 8. There is an iron line at 5231. 



501 „ 5018 Mn 2 3 . 



487*5 „ 4862 Band coincident with the solar line F. 



It is, I believe, much more probable that silicon hydride is the 

 cause of the bands in the spectrum, than that phosphorus is the 

 origin of the three bands in the Langshyttan spectrum. 



Neither silica, a silicate, nor a silicide, such as silico-spiegel, yields 

 bands or lines of silicon in the oxyhydrogen flame, but a highly 

 siliceous pig-iron, charged with much carbon, may react with water- 

 vapour contained in the blast during damp weather so as to evolve 

 carbon monoxide and the compound silicon hydride. This, of course, 



