Modern Copper Smelting / being lectures delivered at Birmingham University, greatly extended and adapted and with and introduction on the history, uses and properties of copper.

by Donald M. Levy

ab

Fig. 6.—Microstructure of Copper containing Oxygen (Heyn).
a. Hypo-eutectic.b. Hyper-eutectic.

Oxygen 0·13 per cent. = 1·16 per cent. Cu₂O.
Oxygen 0·53 per cent. = 4·7 per cent. Cu₂O.

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Fig. 7.—Relations of Copper and Arsenic.