Abstract
Journal de Physique, July.—Prof. Mascart, on magnetisation. A study of the secondary effect produced by the reaction of the polar surfaces on the magnetising field. The author calculates also the influence of the earth's magnetism in producing temporary alteration in the magnedsition of a needle during oscillation, an effect which he finds to have been often exaggerated, and not to exceed 1/1000 part of the whole magnetisation.—P. Duhem, on the calorific capacity of dissociable gaseous combinations. Discussion and expansion of the formulae of Willard Gibbs to explain the variations of specific heat of such bodies as nitric oxide and acetic acid. The results confirm the idea that such variations are due to the gradual dissociation of polymeric forms. —G. Lippmann, an absolute spherical electrometer. Two hollow metal hemispheres, one fixed, the other held by a trifilar suspension, when similarly electrified, repel one another, with a force actually proportional to the square of the potential. The displacements are read optically. —MM. Bichat and Blondlot, on an absolute electrometer with continuous indication. This is an apparatus of three concentric cylinders, the innermost of which is suspended from a balance. The theory of it is already known. —P. Janet, on the formula of Van der Waals, and its application to capillary phenomena. —F. and W. Kohlrauscli, the electro-chemical equivalent of silver (abstracted from Wiedemann's Annalen).
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Scientific Serials . Nature 34, 435–436 (1886). https://doi.org/10.1038/034435c0
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DOI: https://doi.org/10.1038/034435c0