. Transactions . icon uniform. Series XVIL Strength. 1^ Shrinkage. JestNo. Mixture. St 53 Chill. Deadload. Impact Square bar. Flat bar. 1429 F^M pr. ct. carbon 335 330 .23 .166 .200 .60 600 325 460 356 .20 .174 .226 .60 601 532 .19 .197 602 673 525 .19 .256 .261 all. Fig. 8 shows the grain of this series. It is seen by comparing the C member in Series XVI. withthe C member in Series XVII. that 2 per cent, of sulphur re-duced strength 50 pounds, turned the iron white, and increasedshrinkage The reduction of carbon does not turn the ironperfectly white until i
. Transactions . icon uniform. Series XVIL Strength. 1^ Shrinkage. JestNo. Mixture. St 53 Chill. Deadload. Impact Square bar. Flat bar. 1429 F^M pr. ct. carbon 335 330 .23 .166 .200 .60 600 325 460 356 .20 .174 .226 .60 601 532 .19 .197 602 673 525 .19 .256 .261 all. Fig. 8 shows the grain of this series. It is seen by comparing the C member in Series XVI. withthe C member in Series XVII. that 2 per cent, of sulphur re-duced strength 50 pounds, turned the iron white, and increasedshrinkage The reduction of carbon does not turn the ironperfectly white until it reaches per cent. In each of the foregoing series we have ignored the sulphur inthe initial iron which was, in cupola iron about , in F^M, ,and in the white pig-iron per cent. The preceding experiments were each made with ten or fifteenpounds of material, and were conducted as in ordinary foundrywork, and the sulphur was in contact with the melted iron fully as 396 SULPHUR IN 429 ^ 600 601 602 564- 568 long as would be possible in cupola melting, and in several of theseries very much longer. The following experiments were made by placing a small amountof iron and iron sulphide in a small crucible, in a laboratory fur-nace, where it would necessarily be exposed to the heat for a longtime, and the iron and sulphide would have time to form a perfectmixture. As we understand it, the quantity was only sufficient toform a button at the bottom of the crucible. Professor Turner* says that he remelted artificially-prepared ironcontaining eleven per cent, sulphur, and while the sulphur remainedin this case, yet the iron was soft and could be filed and flattened atthe corners with a hammer. Mr. Weston, in Dr. Percys laboratory, took an artificially-madewhite iron, with over four per cent, carbon, but as it contained nosilicon it was white. He added sulphur to this by means of a sul-phide ( S). To the first cast was added per cent, of sul-phu
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
