from The Century Dictionary.

  • noun An instrument for measuring and registering the variations of actinic or chemical influence in the solar rays.

from the GNU version of the Collaborative International Dictionary of English.

  • noun An instrument for measuring and recording the variations in the actinic or chemical force of rays of light.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A recording actinometer


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  • Instrument used to calculate time of photographic exposure. (from Phrontistery)

    May 22, 2008