Actinometer
Nuttall's Standard Dictionary of the English Language · 1890 · p. 3
(Gr., and logos ak-tin-om'-e-ter., science). s. an instrument for measuring the intensity of the sun's actinic rays (Gr. metron, a measure).
Bu kavram başka kaynaklarda da geçiyor
The American Illustrated Medical Dictionary (1913)
A Dictionary of Aviation (1911)
The American Dictionary and Cyclopedia (1910)
Chamber's Twientieth Century Dictionary (1908)
The Optical Dictionary (1904)
Chandler's Encyclopedia (1898)
Zell's Condensed Dictionary (1879)
Dictionary of Science, Literature and Art (1854)
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