Hartley and Ramage — Banded Flame-Spectra of Metals. 



347 



The Flame-Spectrum of Indium. 



The spectrum consists of bands and lines, with tlie bands degraded towards 

 the red. 



The Flame-Spkctrum of Beryllium. 



The oxide was heated in the oxyhydrogen flame. It is to be j^resumed that 

 the spectrum is that of the metal and not of the oxide, as in the case of aluminium. 

 The bands are degraded towards the red. The least refrangible line in tlie spark- 

 spectrum is 4572'7 (Thal^n) and 4571 '9 (Kirchhoff). The arc-spectrum gives a 

 line at 3904-7 (Lockyer). 



Wave- 

 lengths. 



Description. 



4780 

 55 

 33 

 08 



The more refrangible edges of narrow bands, degraded towards the red rays. 



*A spark-line occurs near this wave-length, 3834-7 (Hartley & Adeney), also 3835'2 (Exner & 

 Haschek). 



TKANS. ROY. DtTB. SOC, N.S., TOL. VII., PAET XI. 



3B 



