Note 8 — LECTURE V. Reverberatory Smelting Practice.
Reading edition
When copper combines with sulphur.
2Cu : Cu2S :: 2 × 63·5 : 2 × 63·5 + 32
:: 127 : 159
:: 4 : 5 approximately.
When sulphur combines with iron.
S : FeS :: 32 : 56 + 32
:: 32 : 88
:: 4 : 11.