Luckiesh, Matthew, 1883-1967 · New York, D. Van Nostrand company · leaf 223
195 COLOR PHOTOMETRY some the stimuli dissolve into each other. Whether or not such instruments yield different results is a question to be solved by further investigation. To summarize, the methods of visual acuity and critical frequency are impracticable owing to their … Fig. 88. — -The results of four methods of photometry (Ives). extreme insensitiveness and the influence of eye fa- tigue and adaptation. The influence of the spectral character of light further complicates the visual acuity method. The direct comparison method, though claimed by many to yield…
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