Abstract
PARIS. Academy of Sciences, September 18.—M. Maurice Lévy in the chair.—Variations of volume in Portland cement resulting from setting and hygrometric state, by M. Considère. The expansions of cement prisms immersed in water were studied for a period of over two months, comparisons being made between loaded and unloaded prisms. The expansions increased very regularly, and were much less with a mixture of cement and sand than with pure cement. Owing to this gradual expansion, metal plates holding cement under water may be submitted to much greater stresses than has been hitherto supposed.—On the development of a holomorphic function at the interior of a contour in a series of polynomials, by M. Renaux.—On some experiments designed to confirm Ampère's hypothesis relating to the direction of the elementary electromagnetic action, by M. W. de Nikolaiève.—On Egyptian pottery, by M. H. Le Chatelier. Analyses of five different specimens of Egyptian pottery are given, together with a reproduction of the microscopic appearance of two of them.
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Societies and Academies. Nature 60, 540 (1899). https://doi.org/10.1038/060540b0
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DOI: https://doi.org/10.1038/060540b0