n. instrument that measures actinic action in radiant energy

English contemporary dictionary. 2014.

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  • Actinometer — Actinometers are instruments used to measure the heating power of radiation. They are used in meteorology to measure solar radiation as pyrheliometers.An actinometer is a chemical system or physical device which determines the number ofphotons in …   Wikipedia

  • actinometer — actinometric /ak tin oh me trik, ak teuh noh /, actinometrical, adj. actinometry, n. /ak teuh nom i teuhr/, n. a device for measuring intensity of radiation, esp. that of the sun. Cf. actinograph. [1825 35; ACTINO + METER] * * * ▪ chemistry    …   Universalium

  • Draper , John William — (1811–1882) British–American chemist Draper, who was born in St. Helens, Lancashire, was educated at University College, London, before he emigrated to America in 1833. He qualified in medicine at the University of Pennsylvania in 1836. After a… …   Scientists

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