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 58
y phenomena, where n= critical frequency in cycles per second, 1= illumination, k and jt? are constants. The constant Jc has, however, two different values, one below e25 M.C., another above that illumination. When plotted on semilogarithmic paper this relation is shown by two ' straight lines of… … o to ?0 Critical Frequency-Tlluminatiou Relations for " White " Light. straight lines with the author's apparatus for the " white " light of the standard carbon lamp. The abscissae are logarithms of illumination units (metre candles on magnesium oxide surface, viewed through artificial pupil of 1…
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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