Societies and Academies

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    CAMBRIDGE. Philosophical Society, Jan. 27. A. F. H. Ward: A microcalorimeter A microcalorimeter was described accurate to 00005 cal. The system liberating the heat fits closely inside a copper tube contained in a Dewar flask. A series of iron-constantan thermocouples has one set of junctions making good thermal contact with the tube and the others in a brass ring outside, kept in a thermostat. They are connected to a sensitive moving-coil galvanometer. The Tian multiple walled thermostat is used three concentric thick copper cylinders, insulated with kapok, the inner containing water. The temperature of the outer cylinder is controlled with a mercury regulator, and the insulating layers cut down temperature variations so that the inner vessel is constant to less than 1/500,000 Cº

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