Radiometer
The Optical Dictionary · 1904 · p. 19
(a) An instrument for measuring the intensity of radiant energy. (b) An instrument for the approximate measurement of visual angles.
Bu kavram başka kaynaklarda da geçiyor
Hawkins' Electrical Dictionary (1915)
The American Illustrated Medical Dictionary (1913)
The American Dictionary and Cyclopedia (1910)
An Illustrated Dictionary of Medicine, Biology and Allied Sciences (1907)
The Standart Electrical Dictionary (1892)
Nuttall's Standard Dictionary of the English Language (1890)
A Military Dictionary (1810)
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