References.

Mathewson, E. P., “The Development of the Modern Blast Furnace.” Eng. and Min. Journ., May 27, 1911, p. 1057.

Wright, Lewis T., “Metal Losses in Copper Slags.” Bulletin Amer. Inst. Min. Eng., 1909, Sept., No. 33, p. 817.

Shelby, Geo. F., “Cananea Blast Furnaces.” Engineering and Mining Journal, April 25th, 1908.

Emmons, N. H., “Copper Blast-Furnace Tops.” Bulletin Amer. Inst. Min. Eng., Feb., 1911, p. 119.

“Heating Blast.” Engineering and Mining Journal, June 16 and Sept. 15 and 29, 1906.

“Pyrite Smelting,” T. A. Rickard.

Also the Authors already referred to, Austin (p. 80), Gowland (p. 17), Peters (p. 80).