Abstract
September 6, 1664. Sir Robert Moray produced a letter of Mons. Huygens, dated at the Hague, mention-ing an instrument devised by him for measuring the velocity of descending bodies; as also, a new observation concerning Saturn, made the last spring at Rome, by Campani, viz., that the circle of Saturn had covered a part of its sphere above, and had been covered thereby below, even with a little shadow upon the circle below, and upon the sphere above: which observation Mons. Huygens looked upon as confirming his system, which himself had made.
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Early Science at the Royal Society. Nature 114, 371 (1924). https://doi.org/10.1038/114371a0
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DOI: https://doi.org/10.1038/114371a0