. Transactions. 6^ I 2 3 4 T Fig. 34.—Effects produced by axxealing time of alloy. Infllexce of Tritlratiox Time Again, accelerating the reaction by increasing the trituration timefrom to min., while keeping all other conditions the same, changesthe appearance of the curves from that shown in Fig. 27 to that shown inFig. 28. R 180 has been transformed into R 117, R 178 into R 166, 688 METALLOGRAPHIC PHENOMENA OBSERVED IN AMALGAMS and R 181 into R 130. In these the faint remains of the maxima soprominent in Fig. 27 may be seen. The progressive alteration in shapeas the triturat
. Transactions. 6^ I 2 3 4 T Fig. 34.—Effects produced by axxealing time of alloy. Infllexce of Tritlratiox Time Again, accelerating the reaction by increasing the trituration timefrom to min., while keeping all other conditions the same, changesthe appearance of the curves from that shown in Fig. 27 to that shown inFig. 28. R 180 has been transformed into R 117, R 178 into R 166, 688 METALLOGRAPHIC PHENOMENA OBSERVED IN AMALGAMS and R 181 into R 130. In these the faint remains of the maxima soprominent in Fig. 27 may be seen. The progressive alteration in shapeas the trituration time is progressively increased is, perhaps, still moreclearly shown by Fig. 29, which reproduces R 178 and R 166, and addstwo other curves for the same packing pressure of 400 kg., the first ofwhich (R 169) shows the result of shortening the trituration time min., the second (R 182) the result of lengthening it to 6 6 i 2 3 4 5 6 7 hr». Fig. 35.—Effects of changing size of alloy particles. Influence of Temperature Fig. 30 shows how reducing the temperature from ° to ° curves R 169, R 178, and R 166 into R 172, R 171, and R 170,respectively. This is merely an example of the familiar fact that re-duction of temperature usually retards the rate of a chemical cooling to 5 or 10° C. I have produced such a retardation that it ARTHUR W. GRAY 689 takes many hours to establish the existence of a slow contraction follow-ing the flat maximum. Influence of Mercury-alloy Ratio Fig. 31 shows the effect of changing the mercury-alloy ratio. Theamalgams for R 167 and R 178 were both triturated for min.; but themercury-alloy ratio was in the former and in the latter. Theamalgams for R 166 and R 168 were both triturated for 4 min.; but themercury-alloy ratios were and , respectively. All four speci-mens were in other respects treated alike, being packed
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
