Heyn, E., “Copper and Oxygen.” Charlottenburg, 1900, p. 315.

Metallographist, vol. vi., 1902, p. 48.

Arnold, Engineering, vol. lxi., p. 176. Feb. 7, 1896.

Roberts-Austen, Second Report, Alloys, Research Committee. Proc. Inst. Mech. Eng., April, 1893, p. 114.

Rudeloff, Mittheil. König. Tech. Versuchs. Anstalt., 1894, ii. (b), pp. 292–330; 1898. 16a, pp. 171–219.

Lawrie, Bull. Amer. Inst. Min. Eng., 1909, pp. 857–66. “Bismuth in Wire Bar Copper.”

Johnson, F., “Impurities in Tough Pitch Copper containing Arsenic.” Proc. Inst. of Metals, 1910, vol. iv.; No. 2, p. 163, et seq.

Johnson, F., “The Influence of Impurities on the Properties of Copper.” Metallurgical and Chemical Engineering, Oct. 1910, p. 570. “Annealing of Copper and Diseases of Copper.” Ibid., Feb. 1911, p. 87. “Notes on the Metallurgy of Wrought Copper.” Ibid., August, 1911, p. 396.

See also Standard Specifications for Copper Wire-Bars (recommendations by the Committee of the American Society for Testing Materials). Eng. and Min. Journ., Jan. 20, 1912, p. 181.