. Transactions. gs. 13, 14, and 15 illustrate the appearance ofphosphide in the presence of eutectoid when the same specimen is treatedin different ways. These three photomicrographs illustrate the appearance of sulfideas well as phosphide in bronze, for the alloy that they represent w^as madewith a flux of plaster of Paris covering it in the crucible. The analysisof the alloy showed per cent, copper, per cent, tin, per cent,lead, per cent, phosphorus, per cent, sulfur. In the unetchedsection, the sulfide looked rather dark blue, but when the bronze wasmade dark brown by
. Transactions. gs. 13, 14, and 15 illustrate the appearance ofphosphide in the presence of eutectoid when the same specimen is treatedin different ways. These three photomicrographs illustrate the appearance of sulfideas well as phosphide in bronze, for the alloy that they represent w^as madewith a flux of plaster of Paris covering it in the crucible. The analysisof the alloy showed per cent, copper, per cent, tin, per cent,lead, per cent, phosphorus, per cent, sulfur. In the unetchedsection, the sulfide looked rather dark blue, but when the bronze wasmade dark brown by the etching reagents, the sulfides appeared verylight by comparison, as none of the ordinary reagents attacked had more regular rounded shapes than the phosphides, which hadthe typical form of a eutectic, as illustrated in Fig. 15. These two sub-stances can also ))e readily distinguished by the darker color of thesulfide either in an unetched section or after etching with ammonia and G. F. COMSTOCK 393. ^•?^-J
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
