. Physical researches on sensation [by] Frank Allen [and others]. -tOfj. -4% 5 ■iS -70 Fig. 23. still in the daylight room, by uncovering the eye for the brief ix^riod ofabout thirty seconds which was required to make the chronographicrecord. While uncovering the eye and placing it in the shield attached 752 W. A. Anderson [ & , 8 to the spectrometer eye piece, care was taken to prevent any daylightfrom entering the eye. Between readings the eye was kept blindfoldedfor five minutes. Although the appearance of the spectrum to the darkadapted eye was such as to suggest an increase
. Physical researches on sensation [by] Frank Allen [and others]. -tOfj. -4% 5 ■iS -70 Fig. 23. still in the daylight room, by uncovering the eye for the brief ix^riod ofabout thirty seconds which was required to make the chronographicrecord. While uncovering the eye and placing it in the shield attached 752 W. A. Anderson [ & , 8 to the spectrometer eye piece, care was taken to prevent any daylightfrom entering the eye. Between readings the eye was kept blindfoldedfor five minutes. Although the appearance of the spectrum to the darkadapted eye was such as to suggest an increase in the brightness, yetthe true effect must be judged by the actual measurements measurements, as plotted in Fig. 29, clearly show that the effectof darkness adaptation is to lower the physiological luminosity of thespectrum, a fact, which was pointed out by Allen^ over twenty years effect, as obtained by the writer, is not marked in the most lumi-nous part of the spectrum. This may be caused by the rapid dis-appearance of the effects of darkness adaptation in the
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphysiol, bookyear1902
