rnt\.\n-: KKUTIONS 



un;ii <;.\si:ors 



461 



TABLE X. Experiments on the Reduction of Alumina by Carbon at Atmospheric 



Pressure. 



A. Radiation Heating from Arc. 



B. Resistance Core of Mixture. 



Experiment 

 Xo. 



Product 



Observations. 



G61 



G62 



Total energy, about 



1 kilowatt hour 

 Power, 4 kilowatts 



Total energy, 5'8 kilo- 

 watt hours 

 Power, 7 kilowatts 



Fond lump of 

 alumina. No 

 Al or carbide 



Condensate, 

 but negligible 

 Al in fused 

 lump 



Cross-section of furnace hearth, 130sq. ecu tiros. ; 

 length, 20 centims. Charge, consisting of 

 central core of alumina and carbon sur- 

 rounded by pure alumina. Thick iron plates 

 served to cover furnace. No aluminium 

 condensate obtained. 



Similar construction to above, but cover fitting 

 air-tight, and provided with long condensing 

 chamber. Escaping gas deposited sublimate 

 containing finely divided aluminium. 



