ders the passage of are colorless, while others derive various tints from crystallize. The crystals of corundum thus produced ,ny air between the jet and the surface impossible, were colorless, but rubies were obtained by adding the presence of metallic oxides. Red, blue, green, and f, however, the… … Fig. 2.—Blowpipes and oxygen cylinder in Paquier's ruby factory. Fig. 4—Examining artificial rabies, and mounting them on rods for cutting. ARTIFICIAL RUBIES.
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