. Transactions. a. Eutectic. b. Iron. c. Sulphide. Excess of Iron. Magnified 270 Diameters. a. Euteetie. b. Iron. c. Sulphide. Eutectic. Magnified 780 Diameters. Fig. a. Rod-like Crystal, b. Eutectic. c. Ferrite. d. Matte Globule. Iron Bottom—No. 39. Mangified 130 Diameters. NTRATION Of GOLD AND 3ILVIH IN [R0N-BOTT0M8. I 1 steel parlance. In Fig. 8 is shown a like photograph, exceptthai the pure sulphide has been fused with an en >f buI- phur at a low heat The analysis f the Bulphide now iefollows: Cu, ; S, 20i 8iO and graphite, ; Total•J per cent The theoretical composition is
. Transactions. a. Eutectic. b. Iron. c. Sulphide. Excess of Iron. Magnified 270 Diameters. a. Euteetie. b. Iron. c. Sulphide. Eutectic. Magnified 780 Diameters. Fig. a. Rod-like Crystal, b. Eutectic. c. Ferrite. d. Matte Globule. Iron Bottom—No. 39. Mangified 130 Diameters. NTRATION Of GOLD AND 3ILVIH IN [R0N-BOTT0M8. I 1 steel parlance. In Fig. 8 is shown a like photograph, exceptthai the pure sulphide has been fused with an en >f buI- phur at a low heat The analysis f the Bulphide now iefollows: Cu, ; S, 20i 8iO and graphite, ; Total•J per cent The theoretical composition is: Ou, ; 8, : Total 100 per cent This matte upon cooling was found to be Burprisingly brittle that large pieces could he crushed by the fingers. In fracturewas unusual, being along the surfaces of large elongated grainshaving polished black Burfaces like tho gunpowder kernels. Evidently there is an i of sulphur to bo accounted for. A metallographic inspection shows the sulphur, probably in the form of CuS, lying between the crystal bound-aries, and thus producing planes of weakness. One of theseboundary lines is shown crossing the center of the
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
