212 Mr. G. A. Hemsalech : A Comparative Study 



researches on flame and spark spectra, I have arrived at 

 conclusions which differ materially from those advanced by 

 Vr. King, and my interpretation of the phenomena will be 

 lound to present the whole question as to the origin of both 

 flame and furnace spectra in a new light. 



§ 2. Description of Furnace. 

 The furnace employed in this research was of a simple 

 type and very similar in design to that used by Messrs. Duffield 

 and Rossi*. Carbon tubes from 6 to 12 inches long with 

 20 mm. external and 14 mm. internal diameter, are tightly 

 clamped between two pairs of graphite bars 1 inch thick by 

 2 inches high each. The lower ' 



bars are about two feet lono- 



Fig. 1. 



"aphite Bars 



Gases 



Sectional View of Furnace. 

 Fig;. 2, 



o 



inn 



Method of clamping Furnace Tube. 



and are joined to the mains which communicate with the 

 dynamos ; the upper bars are one foot long. The clamping- 

 arrangement is easily understood from figs. 1 and 2. The 



* W. G. Duffield and E. Rossi. Astrophysical Journal, vol. xxviiL 

 p. 371 (1908). 



