Abstract
LONDON. Society of Chemical Industry, January 5.—Dr. W. R. E. Hodgkinson in the chair.—J. L. Strevens: The viscosity of oils. The author, after emphasising the importance of the determination of absolute viscosity and its relation to temperature for any particular lubricant, proceeds to correct certain figures previously published.—L. T. Wright: The oxygen content of the gases from roasting pyrites. The author on examining a number of analyses of “burner” gas from i various sources noticed that the oxygen “deficiency” is the greater the greater the dilution of the gas, and i this suggests that there is in addition to the well known production of SO3 and metallic sulphates some I other cause, such as a constant error in the analyses,? which influences these. In any case, the evidence of i these gas analyses shows that the manner in which the oxygen is disposed of would prevent the “burner” gas containing more than about 12 per cent, of SO2 as a maximum when all the oxygen of the air supplied was used up, and the author states that his various attempts to obtain more than this in practice by keeping burner gas long in contact with incandescent pyrites have failed.—L. C. Jackson, L. McNab, and A. C. H. Rothera: The electrical conductivity of milk -during the concentration, with suggestions for a practical method of determining the end point in the manufacture of sweetened condensed milk. Although the measurement of electrical conductivity is of no value in determining the degree of concentration of a separated unsweetened milk, it can be made the basis of a working process for watching the concentration of sweetened whole milk:. A device in which the resistance of sweetened milk in the vacuum pan is compared with that of an approved sample of condensed milk maintained at exactly the same temperature is described.—S. J. Johnstone: Monazite from some new localities. Wide variation may occur in the quantity of thoria present in samples; notable amongst these are ranges shown by those.from Ceylon, the thoria percentage of which varies from 9.5 to 28.2; from Malava, 3.4 to 9.4; and from northern Nigeria, 2.3 to 8.0.
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Societies and Academies . Nature 92, 572–573 (1914). https://doi.org/10.1038/092572b0
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DOI: https://doi.org/10.1038/092572b0