Bryn Mawr College monographs . be noted by comparing the percentages in Column 2 with50 per cent; in Column 3 with 25 per cent; and in Column 4 with 8 33per cent. Stimulus Relation ofphotometric value of1/2 A to Aexpressed in per cent Relation ofphotometric value of1/4 A to Aexpressed in per cent Relation ofphotometric value of1/12 A to Aexpressed in per cent Red (655 mm)Orange (616 ^Ji^x)Yellow (580 mm)Yellow-green^ (533 mm)Green (522 mm) (488 ^x^,)Blue (463 iJitx)Violet (439 fxtx)
Bryn Mawr College monographs . be noted by comparing the percentages in Column 2 with50 per cent; in Column 3 with 25 per cent; and in Column 4 with 8 33per cent. Stimulus Relation ofphotometric value of1/2 A to Aexpressed in per cent Relation ofphotometric value of1/4 A to Aexpressed in per cent Relation ofphotometric value of1/12 A to Aexpressed in per cent Red (655 mm)Orange (616 ^Ji^x)Yellow (580 mm)Yellow-green^ (533 mm)Green (522 mm) (488 ^x^,)Blue (463 iJitx)Violet (439 fxtx) 289 STUDIES IN PSYCHOLOGY Chart I Showing the change in the relative selectiveness of the achromaticresponse of the eye to wave-length produced by varying the intensityof the light. In this chart is represented the photometric value inmeter-candles of wave-lengths selected from eight different parts ofequal energy spectra sustaining to each other the following ratios ofintensity: A, H A, ^ A, and 1/12 closed sector inserted between the collimator lens and theprism of the spectroscope. The photometric-radiometric com-parison was made with the apparatus and by the method al-ready described. A graphic representation of these results isgiven in Chart I. In order to show the changes in the selectiveness of theachromatic response to wave-length produced by changing theintensity of light, Table II has been prepared. In the severalcolumns of this table are shown in per cent, of the originalvalue the photometric values of each of the colored lightswhen their energy values have been reduced respectively to1/2, 1/4 and 1/12 of the values present in Spectrum A. SinceA is an equal energy spectrum, the reduced spectra are alsoequal energy spectra. The changes in the deviations of therelative photometric from the relative radiometric values pro-duced by the changes of intensity will be noted by comparingthe percentages in column 2 with 50 per cent.; in col-umn 3 with
Size: 2163px × 1155px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorbrynmawr, bookcentury1900, bookdecade1900, bookyear1901
