272 JOSEPH STRUTHERS 



aluminum reduction process. The process of purifying the 

 bauxite consists in submitting it to a prehminary heating 

 for some hours in the presence of carbon and metalhc alum- 

 inum in an electric furnace, during which time the iron oxide 

 and the silica become reduced to metallic iron and silicon 

 and combine with the aluminum to form a heavy alloy, which 

 can be detached easily from the mass of purified bauxite after 

 it has cooled. 



Within the past year or so a company at Niagara Falls, 

 N. Y., has consumed a considerable quantity of bauxite for 

 the manufacture of abrasive wheels. 



