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40icker abnormal color sense acetylene flame achromatic lens agreement average eye average visibility curve bility curve blue sensitive Coblentz 1 Emerson coincidence color blindness color perception color vision computed correction determined diffuse light diffuse radiation disk energy distribution energy measurements Equality of bright equality-of-brightness method flicker method flicker photometer g-cal galvanometer given group of observers illumination infra-red intensity lamp large number lens low sensibility luminous magnesium oxide maximum visibility meter candles method of photometry Nernst glower Nicol prisms normal Nutting overestimated photometric field Phys present investigation radiometric red sensitive Relative Visibility retina screen shown in Fig slit spectral spectrometer spectroscope stars stray light subjects examined Table telescope tube thermopile tion total number transmission underestimated various observers violet visi visibility curve obtained visibility measurements Visibility of Radiation visible spectrum visual measurements VISUALLY PERCEPTIBLE watt yellow