. Physical researches on sensation [by] Frank Allen [and others]. Plate I. Classes of Persistency Curves of Color-blindness. AMERICAN JOURNAL OF PHYSIOLOGICAL OPTICS .040 .035 .030 .025 .020 X)15 XIO X)40 ^35 ,030 ,025 .020 X)15 .010 .040 .035 .030 .025 .020 .015 i ■\ \ I • sV CLA£ S III .c. / ; \ U CLA5 S /*• A CLAS S III .H. L \ ./? / / Jt \\■A 7 / \ ItItft A \ / // / 7 X/ / \, / // // // / p / ^ I-^Vrf ^ig. 1 ^ 2 1 ^-.^ Vig. 3 - • 0* -oc. i ouo u 1\ f A / S III / >S III / U CLAs!s ^ 11 (RT. EYE) ■t (LT. EYE) 1 r V \ // V ;• V v±. ■-Vg . 5 1 ^\Z
. Physical researches on sensation [by] Frank Allen [and others]. Plate I. Classes of Persistency Curves of Color-blindness. AMERICAN JOURNAL OF PHYSIOLOGICAL OPTICS .040 .035 .030 .025 .020 X)15 XIO X)40 ^35 ,030 ,025 .020 X)15 .010 .040 .035 .030 .025 .020 .015 i ■\ \ I • sV CLA£ S III .c. / ; \ U CLA5 S /*• A CLAS S III .H. L \ ./? / / Jt \\■A 7 / \ ItItft A \ / // / 7 X/ / \, / // // // / p / ^ I-^Vrf ^ig. 1 ^ 2 1 ^-.^ Vig. 3 - • 0* -oc. i ouo u 1\ f A / S III / >S III / U CLAs!s ^ 11 (RT. EYE) ■t (LT. EYE) 1 r V \ // V ;• V v±. ■-Vg . 5 1 ^\Z Fig. 6 M \ — ^1 \ \ l\ tV p f \ 1 ■oA CLASC S IV F. / \l\l S IV .J. / \ CLAS R. S IV /K. / « ?/ / j // \ /f s, ^ \ / i / / N. / / V Fig. 7 l^^o^ Fig. 8 •^^ Fig. 9 .40/i .50 .60 70 .40 .,50 .60 .70 .40 .50 .60 .70 Wave Length* Plate II. Classes of Persistency Curves of Color-blindness. 40 IRIMARV C( SENSATIONS -ALLEN. .*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 colors.
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