Alumina

(noun.) any of various forms of aluminum oxide occurring naturally as corundum.

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• The Cowles process heats to incandescence by the electric current a mixture of alumina, carbon and copper, the reduced aluminum alloying with the copper. Edward W. Byrn. 十九世纪发明进展.
• It has, however, for the most parts been superseded by the process patented by Hall, April 2, 1889, No. 400,766, in which alumina dissolved in fused cryolite is electrically decomposed. Edward W. Byrn. 十九世纪发明进展.
• The process of manufacture of rubies is carried on with the oxyhydrogen blow-pipe, to whose intense heat the powdered alumina with its coloring oxides is subjected. 佚名. 神奇的知识之书.
• Among other lining materials found suitable were soapstone, alumina, ammonia, copperas, starch, Epsom salts, and gypsum, paper, pulp, and alum, and a mixture of various other materials. 威廉·亨利·杜利特. 世纪发明.
• The ruby, chemically considered, is crystallized alumina, or oxide of aluminum, with a small percentage of oxide of chromium. 佚名. 神奇的知识之书.

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