. Physical researches on sensation [by] Frank Allen [and others]. .*Ofi 50 oO O *0 to 60 70 •♦O txj OO VV*«« L.«ngtha 111. t. nsvi> ui IcrsistciuN Curves of Color-blinilncss. 41 AMERICAN JOURNAL OF PHYSIOLOGICAL OPTICS my eye with white light from an electric arc and obtainedthe persistency curve shown in Fig. 26. In this, the wholefatigue curve is elevated above the normal. This it will beobserved is exactly like the one obtained by a totally color-blind person and shown in Plate III, Fig. 9, Class white light, indistinguishable from ordinary white, maybe obtained by mixing t
. Physical researches on sensation [by] Frank Allen [and others]. .*Ofi 50 oO O *0 to 60 70 •♦O txj OO VV*«« L.«ngtha 111. t. nsvi> ui IcrsistciuN Curves of Color-blinilncss. 41 AMERICAN JOURNAL OF PHYSIOLOGICAL OPTICS my eye with white light from an electric arc and obtainedthe persistency curve shown in Fig. 26. In this, the wholefatigue curve is elevated above the normal. This it will beobserved is exactly like the one obtained by a totally color-blind person and shown in Plate III, Fig. 9, Class white light, indistinguishable from ordinary white, maybe obtained by mixing two complementary colored lights,observations of the persistence of vision were made afterfatiguing the retina with proper combinations of Figure 28. Persistency Curve of the Eye Fatigued with Complementary Colors, Red and Green. 42 PRIMARV COLOR SENSATIONS ALLEN Two overlapping spectra were formed in a color mixingspectrometer aiul the selected complementaries combinedin a shutter eyepiece. Ihe intensities of the two componentcolors were adjusted so as to give a pure white light. Thefirst pair of complementaries used were yellow .577,. andblue .474M as determined by \on Kries. The second pairwere red .656« and green .492,i as determined by persistency curve for the former pair is shown in Fig. 27and that for the latter in Fig. 28. On comparing the figures both curves are seen to beessentially the same and also to differ greatly from the whitefatigue curve of Fig. 26. Instead of the whole of the com-plementary color curves being elevated above the normal,the part corresponding to green is actually depressed belowthe normal. Thev bear in fact a close resemblance to thecurves obtained for the cases of red-vi
Size: 1083px × 2307px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectphysiol, bookyear1902
