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(-m"tr), n.[L. radius radius + -meter: cf. F. radiomtre.] 1. (Naut.) A forestaff. 2. (Physics) An instrument designed for measuring the mechanical effect of radiant energy. It consists of a number of light disks, blackened on one side, placed at the ends of extended arms, supported on a pivot in an exhausted glass vessel. When exposed to rays of light or heat, the arms rotate. スポンサード リンク
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