Hemsalech. 



Phil. Mag. Ser. 6, Yol. 40, PL IX. 



Thermo-chemical and Thermo-electrical Excitation of Light Radiations 



in Metal Vapours. 



4982 t; 



- 3829 ) 

 3832 >Mg. 

 - 3838 ) 



■ 3956) . 

 3958 J "■ 



PJate temperature : about 3000° C. Drop of Potential along plate : about 8 



volts . 

 cm. 



