Abstract
MEASURES OF JUPITER.—Numerous visual and photographic measures of the diameter of this planet have been made by the Rev. Father S. Chevalier, S.J., of the Zô-Sé Observatory, during 1912–13 (Mem. Soc. Spett. Ital. July, 1915). The Gautier micrometer used in the visual work provides for the measures being made by bringing two strips of platinum tangential to the limbs of the planet, either (i) internally, i.e. with both strips seen in front of the disc, or (ii) externally, both strips beyond the disc. The two sets of measures thus obtained were of closely similar accuracy. In the photographic work very many separate exposures were made on each plate, affording material for a considerable body of measures. The exposures were graded in seven groups according to intensity, and measures on only four of these sets were used in taking the means. The discarded groups were those in which the images were considered either too small through under-exposure or enlarged by irradiation. The mean results may be summarised as follows:—
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Our Astonomical Column . Nature 96, 154–155 (1915). https://doi.org/10.1038/096154a0
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DOI: https://doi.org/10.1038/096154a0