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Scientific American, Vol. 39, No. 24 (1878) (1878)
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h kind raised to 1,200 degrees, and the time of exposure to six or heat the crown of the furnace.” This is an important mat- produced, for what it is used, and to what other countries it seven hours, the skin of sesquioxide will resist every mechan- is exported. The able compiler of these… … © 1878 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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