Societies and Academies

Abstract

LONDON. Faraday Society, December 15, 1919.—Prof. A. W. Porter, vice-president, in the chair.—A. G. Tarrant: The measurement of physical properties at high temperatures. An account is given of experiments made upon refractory materials with the view of measuring certain physical properties at high temperatures, particular attention being paid to thermal expansion, tensile strength, and thermal conductivity.—Lieut. W. A. Macfadyen: An aspect of electrolytic iron deposition. The experiments detailed were carried out in seeking the best conditions for obtaining thick, hard, adherent deposits of iron on steel-mechanism parts which had been machined too much or worn down in a few places, and thus rendered useless, so as to enable the scrapped parts to be replaced in use after treatment.—J. G. Williams: The electrolytic formation of perchlorate. It is pointed out that present practice in electrolytic preparation of perchlorate uses much higher temperature of liquor and current density than is given in text-books.—Prof. A. W. Porter: The vapour pressure of binary mixtures. In order to remove _ difficulties in connection with the proof of the Duhem-Margules formula for the vapour pressures of binary mixtures, a simplified proof is given which makes clear the extent of the usual approximations in each step of the proof.—Prof. E. D. Campbell: The solution theory of steel and the influence of changes in carbide concentration on the electrical resistivity. Baly's force-field theory is applied to the case of the solid solution of the non-ferrous elements in steel. The experimental portion of the paper describes a research on the influence of the decarburisation by means of hydrogen of a series of alloy steels on the electrical resistivity, when the metal is in both the annealed and hardened condition. —S. Horiba: Some relations between the solubilities of solutes and their molecular volumes.—Dr. E. J. Hartung: (i) An accurate method for the determination of vapour pressure. (2) Some properties of copper ferrocyanide.