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Societies and Academies

    Naturevolume 81pages119120 (1909) | Download Citation



    LONDON. Physical Society, June 25.— Dr. C. Chree, F.R.S., president, in the chair.—A transition point in zinc amalgam: Prof. H. S. Carhart. The paper gave the preliminary results of an investigation which has for its primary object the determination of the heat of dilution of zinc amalgams. This heat of dilution is negative, that is, the dilution of zinc amalgam by the addition of mercury absorbs heat. In the course of the experimental work, which was conducted by Dr. W. D. Henderson, phenomena so extraordinary were encountered that the concentration at which they occur was called a transition point in zinc amalgam. The method employed was electrical, by means of a concentration cell, the only difference between the two legs of the cell of H-form being in the concentration of the amalgam composing the electrodes.—A, method of producing an intense cadmium spectrum, with a proposal for the use of mercury and cadmium as standards in refractometry: Dr. T. M. Lowry. Of the twenty-six wave-lengths that have been used in the study of rotatory dispersion (Proc. Roy. Soc., lxxxi., p. 472, November 19, 1908) the following seven have been found to be the most suitable for general use:—

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