Studies in the photometry of lights of different colours [electronic resource] / spectral luminosity curves obtained by the equality of brightness photometer and the flicker photometer under similar conditions (1912)
Ives, Herbert Eugene, 1882-1953, Parsons, John Herbert, Sir, 1868-1957, donor, University College, London. Library Services · [London : s.n.] · leaf 60
Mr. H. E. Ives on the 358 curves are those for deep red ('650 yu,) and for blue (*480 p). The red curve maintains its direction. The blue curve changes from a diagonal to a horizontal line ; that is, the critical frequency becomes a constant, independent of illumi- nation. The behaviour of the… … Critical Frequency^Illumination Relations for Different Colours. A simple relationship therefore exists between the luminosity curves at different illuminations, as given by this method. In the region above the change of direction we have, if Sx is the slit-width at X, F the critical frequency, F =…
Ophthalmology · Eye · Light · Color blindness · Color vision · Photometry · Brightness perception · Color Vision Defects
Internet Archive · UCL Library Services, University College London (UCL) · Public domain (published before 1931). Free to use for anything.
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