[17] There was less residue on the charges during this month, which accounts for the larger tonnage with a lower blast.
[18] Translation of a paper read before the Naturwissenschaftlicher Verein at Aachen, and published in Metallurgie, 1905, II, i, 1-6.
[19] 35 to 40 cm. = 13.78 to 15.75 in. = 8 to 9.12 oz. per sq. in.
[20] Engineering and Mining Journal, 1904, LXXVIII, p. 630; article by Donald Clark; reprinted in this work, p. 144.
[21] Owner of the patents.—Editor.
[22] Abstract of a paper in Metallurgie, II, 18, Sept. 22, 1905, p. 433.
[23] This method is described further on in this book.
[24] Translated from Metallurgie, Vol. II, No. 19.
[25] British patent, No. 17,580, Jan. 30, 1902, “Improved process for desulphurizing sulphide ores.”
[26] W. C. Roberts-Austen, “An Introduction to the Study of Metallurgy,” London, 1902.