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actinic balance

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

Bolometer \Bo*lom"e*ter\, n. [Gr. ? a stroke, ray + -meter.]
   (Physics)
   An instrument for measuring minute quantities of radiant
   heat, especially in different parts of the spectrum; --
   called also {actinic balance}, {thermic balance}. --S. P.
   Langley.
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