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An instrument for measuring the direct heating power of the sun's rays.

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  1. n. An instrument for measuring the direct heating power of the sun's rays.
  2. n. An instrument for measuring the actinic effect of rays of light.
  3. n. an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect)
  4. (a) An instrument for measuring the direct heating power of the sun's rays. (b) An instrument for measuring the actinic effect of rays of light.
  5. n. an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect)