4 Hemsalech, spectrum of the Glow Discharge. 



anade with a glass prism, extend only to A = 3570 about, 

 but no doubt the last three bands of radium observed by 

 Sir W. and Lady Huggins will also have their corres- 

 ponding bands in the glow discharge. 



Glow Discharge 



at Atmospheric 



Pressure. 



Radium 

 Glow. 



Vacuum Tube. 



Negative Pole. 



Positive Pole. 



4277-8 



4280 



4278*6 Hasselb.^ 





4058-5 



4065 





4059-0 Hasselb.* 



3997-2 



4000 





3998-0 



39144 



3914 



3914-4 Deslandres^ 





3804-4 



3800 



... 



3804-8 Deslandres^ 



3755-2 



3760 





3755-1 » 



3576-6 



3580 



3582-3 



3576-8 „ 



... 



3545 



3549-0 



3537-2 



... 



3370 





3372-5 



(31557 

 Berndt,^ oscill. 



3155 





31587 „ 



spark) 









This band spectrum of the glow discharge is very 

 characteristic in that it consists of bands selected from 

 both the negative and positive band spectra of nitrogen. 

 It seemed interesting to see whether these two band- 

 spectra had a separate and distinct existence at atmospheric 

 pressure. The negative band spectrum is easily obtained 

 by the introduction of some self-induction in the discharge 



^ B. Hasselberg, Mhn. Acad. Saint- Pitersbourg, t. 32, No. 15, 1885. 

 ^ H. Deslandres, Theses de doctorat, Paris, 1888. 

 ^ G. Berndt, Drude's Ann., Vol. 4, p. 788, 1901, 



