. Physical researches on sensation [by] Frank Allen [and others]. are plotted in fig. 3, and give a curve withone elevation, similar to that for the wave-length A, 680 , curves were obtained for the wave-lengths \ GSl/xand X *625 yu,, the data for which are tabulated in Table II. andTable III. respectively. Table II. X. Normal Eye fatigued X. 1 Normal Eye fatigued Persistence. with X •OJl //. Persistence. with X -C^sl /x. 733 ;i •0318 sec. •0353 sec. •530/i ... •0177 sec. 695 •0232 •0254 •500 •0180 sec. •0189 663 •01S5 •0107 •460 •0310 601 •0144 •0145 •430 •0468 ... 664 •0147 •0153
. Physical researches on sensation [by] Frank Allen [and others]. are plotted in fig. 3, and give a curve withone elevation, similar to that for the wave-length A, 680 , curves were obtained for the wave-lengths \ GSl/xand X *625 yu,, the data for which are tabulated in Table II. andTable III. respectively. Table II. X. Normal Eye fatigued X. 1 Normal Eye fatigued Persistence. with X •OJl //. Persistence. with X -C^sl /x. 733 ;i •0318 sec. •0353 sec. •530/i ... •0177 sec. 695 •0232 •0254 •500 •0180 sec. •0189 663 •01S5 •0107 •460 •0310 601 •0144 •0145 •430 •0468 ... 664 •0147 •0153 Tabl ElII. X. Noruiiil Eye fatigued X Normal Eye fatigued Persistence. with X625ju. /\. Persistence. with X 625 n •733 ;x •0;il8 sec. •03C)4 Bee. •530/i •0170 sec. • •0232 •0249 •500 •0189 sec. •0194 •663 •01 b5 •0190 •460 ■0310 ... •601 •0144 •0144 •430 •0458 • ■• •564 •0147 •0162 I ... • * • • • • •SfiiCirnin uml the Imnirj ir Fi{,. 3. 59. AO/U Wa\^e Length. The corresponiliiiir curves aro shown im u-. J» .iiul li. (..Roth are of the saiiit* tv|Mi, an«l exhihit two elevationssimihir to those in the curve for the wave-length \>i^[}fi inH^ii. i>. As these measurements are tedious to make, I yieldeilto the temptation to determine those curves, and a few others,as will l((> iiotiiHd. only for tlioso parts where experience shows GO Prof. F. Allen on Four Transition Points in the the elevations can occur. There can be no doubt that therest of the curve would cohicide with the normal. Fig. 4.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectphysiol, bookyear1902
