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Dynactinometer

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Dynactinometer \Dy*nac`ti*nom"e*ter\, n. [Gr. ? power + E.
   actinometer.]
   An instrument for measuring the intensity of the photogenic
   (light-producing) rays, and computing the power of object
   glasses.
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