“The Principles of Manufacture of Iron and Steel,” Sir I. L. Bell, George Routledge & Son, London.

CHAPTER VI

“The Business Message of the Wrought Iron Bar,” Interstate Iron and Steel Co., Chicago.

“The Control of Quality in Every Process,” A. M. Byers Co., Pittsburg, Pa.

CHAPTER VII

“The Cementation of Iron and Steel,” Gioletti, McGraw-Hill Book Co., New York.

“The Fine Steel Industry,” J. A. Mathews, The Halcomb Steel Co., Syracuse, New York.

CHAPTER VIII

“Sir Henry Bessemer—An Autobiography,” Offices of Engineering, London.

“The Romance of Iron and Steel—The Story of a Thousand Millionaires,” H. N. Casson, Munsey’s Magazine, April, 1906, and on; In book form, A. S. Barnes & Co., New York.