Fibrous copper from a fine metal furnace bottom
before 1889
pulverized copper scale
before 1889
Result of heating one equivalent of copper with one of protoxide of lead
before 1889
Result of heating one equivalent of cupric oxide with two of oxide of lead
before 1889
Result of heating one equivalent of copper with two of protoxide of lead
before 1889
Copper scale heated to redness with access of air, and thereby converted into cupric oxide
before 1889
Bisulphide of copper
before 1889
Result of heating four equivalents of cupric oxide with one of lead sulphide
before 1889
Artificial copper pyrites
before 1889
Result of heating sulphide of copper with carbon
before 1889
Sand bottom of roaster furnace
before 1889
"Refinery slag" from Sutton Copper Works
1871
Result of heating three equivalents of cupric oxide and two of metallic lead
before 1889
Refinery slag from the Mines Royal Copper Works
before 1889
Crystalline deposit on walls at Copper Works, Mines Royal
1869
Result of heating one equivalent of sulphide of copper with one of iron
before 1889
Result of heating one equivalent of cupric oxide with one of metallic lead
before 1889
Result of heating silica with cupric oxide in the proportion of 84:116
before 1889
Result of heating one equivalent of cupric oxide with two of metallic lead
before 1889
Result of heating silica with cupric oxide in the proportion of 44:58
before 1889
Bisulphide of copper
before 1889
Globular concretions of copper
before 1889
Result of heating one equivalent of cupric oxide with one of lead sulphide
before 1889
Crystalline bright black needles forming on the surface of malleable copper
before 1889
Artificial copper pyrites
before 1889
Massive bisulphide of copper
before 1889
Venallt coal
before 1871
Result of heating three equivalents of cupric oxide with two of lead sulphide
before 1889
Result of heating two equivalents of sulphide of copper with one of iron
before 1889
Fibrous copper from a fine metal furnace bottom
before 1889
Yellow copper ore fused and stirred with metallic iron
before 1889
Specimen showing moss copper outside and inside the regulus
before 1889
Result of heating one equivalent of cuprous oxide with one equivalent of oxide of lead
before 1889
Result of heating one equivalent of copper with six of peroxide of lead
before 1889
Result of heating one equivalent of sulphide of copper with four of iron
before 1889
Result of heating three equivalents of copper sulphide and one of antimony
before 1889
Result of heating two equivalents of copper and one of sulphate of lead
before 1889
Result of heating one equivalent of silver sulphide with two of cupric oxide
before 1889
Result of heating two equivalents of copper sulphide with three of lead
before 1889
Result of heating one equivalent of copper sulphide and two of lead
before 1889
Experimental liquation of lead from copper. Stage 2
before 1889
Result of heating one equivalent of copper sulphide and one of tin
before 1889
Result of heating 18 equivalents of copper with one of tersulphide of antimony
before 1889
"Fine metal
before 1889
Regule from the second fusion in making best selected copper
before 1889
Regule of first running down in the process of making "best selected" copper
before 1889
Result of experiment on roasted pyrites with lead
before 1889
Roaster slag from the Mines Royal Copper Works
before 1889
Old copper slag from the Swansea district
before 1889
Result of experiment on roasted pyrites and lead
before 1889