The physical photometer in theory and pr
โ
W.W. Coblentz
๐
Article
๐
1915
๐
Elsevier Science
๐
English
โ 707 KB
IT is well known that the photometry of light sources which are different in color is subject to great errors. In order to obviate this difficulty some form of radiometer which, unlike the eye, functions independently of the frequency (wave-length) and the intensity of the stimulus, has been advocat