Abstract
PARIS Academy of Sciences, September 17 (C.R., 199, 593-608).—CHARLES CAMICHEL, EUGENE FISCHER and LEOPOLD ESCANDE: The use of different vertical and horizontal scales in studies on reduced models in hydraulics. The practice is common in laboratory experiments in hydraulics. There is no geometrical similitude between the work and the model: the latter is a conventional representation of the work to be studied and there is no theoretical reason for assuming that the hydraulic movements existing in the model will be the representation, on the same conventional bases, of phenomena capable of being reproduced in the work. Experiments bearing on this problem are described and it is found that in some respects, such as the surfaces examined in the actual study, there is no concordance between the various models. PAUL DELENS: Isothermal families of developable surfaces. A. J. MACINTYBE:—A theorem on ultraconvergence. R. DE MALLEMANN and P. GABIANO:—The magnetic rotatory power of hydrogen arsenide and of hydrogen phosphide. Hydrogen arsenide gave a Verdet constant of A0 = 68 × 10-6 (minute): hydrogen phosphide, 4-60 – 57 × 10-6 (minute). J. WOHLGEMUTH:—Study of the binary systems water ‘sodium hydra-zoate, water’ potassium hydrazoate. T. TARA-DOIRE:—The action of sulphur on chlorates. Mixtures of barium chlorate and sulphur, or of lead chlorate and sulphur are stable when dry and can be kept for a long time in closed vessels without alteration. On adding water, these mixtures after a time inflame spontaneously at the ordinary temperature. The presence of combustible material is not a necessary condition for inflammation. Louis FAUCOUNAU:—The action of ethylene oxide on acetylene magnesium compounds: the preparation of substituted acetylenic alcohols of the type R.C = C.CH2.CH2OH. The preparation and properties of the alcohols containing amyl, hexyl and phenyl are described. ALFRED CARPENTIER: Contribution to the study of the male fructifications of the Neuropterideae.
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Societies and Academies. Nature 134, 673–675 (1934). https://doi.org/10.1038/134673b0
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DOI: https://doi.org/10.1038/134673b0