Abstract
American Journal of Science and Arts, November.—Mr. Stockwell, who has been systematically examining the physical theory of the moon's motion, here calls attention to a secular inequality in that motion, produced by the oblateness of the earth. For attracted points out of the plane of the equator, and not beyond the parallels of 35° 16′ (which is the moon's case), the attraction of the earth is less than it would be if the latter were spherical. The author says he has found several inequalities in the moon's motion, not recognised by existing theories, and of even greater practical importance than the foregoing.—The diamagnetic constants of bismuth and calc-spar in absolute measure have been determined by Prof. Rowland and Mr. Jacques. In their paper the former develops mathematical expressions for the various coefficients of magnetisation, while the latter describes the experimental method adopted: first, exploration of the field, and then noting the time of swing of little suspended bars of the substances in it. The constants for bismuth are
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Scientific Serials . Nature 21, 122 (1879). https://doi.org/10.1038/021122a0
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DOI: https://doi.org/10.1038/021122a0