Note 15 — LECTURE VII. Modern Blast-Furnace Practice (Continued).

These views have recently been controverted in an interesting paper by G. A. Guess. (“Notes on Pyritic Smelting,” Engineering and Mining Journal, 1912, Jan. 13th, p. 113). He defines Pyritic Smelting as the production of a Ferrous Silicate Slag from Iron Sulphide Ore.