Wolfram
Tungstate of protoxide of iron; occurs in Cornwall, in the Bohemian tin-mines, and in Siberia. Its composition is tungstic acid 78.77, protoxide of iron 18.32, protoxide of manganese 6.22, silex 1.25. See TUNGSTEN.
Twelve hundred entries from the golden age of cast metal — how bells are founded, why brass is not bronze, what a cupola melts and a core withstands — by Simpson Bolland, the trade's great teacher.
Tungstate of protoxide of iron; occurs in Cornwall, in the Bohemian tin-mines, and in Siberia. Its composition is tungstic acid 78.77, protoxide of iron 18.32, protoxide of manganese 6.22, silex 1.25. See TUNGSTEN.