von Helmersen, Das Olonezische Bergrevier (St Petersburg, 1860); Turbin, The Dnieper; Prasolenko, " The Dniester," in Engin.
Survey, 1901); Greenleaf, "Western Floods," in Engin.
civ., 1881, p. 450) in which barium monoxide is heated in a current of air, forming the dioxide, which when the retorts are exhausted yields up oxygen and leaves a residue of monoxide; but this method is now being superseded, its place being taken by the fractional distillation of liquid air (The Times, Engin.
For other methods of obtaining vanadium and its compounds, see Cowper Cowles, Engin.
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