The Philosophical magazine; a journal of theoretical, experimental and applied physics . the retinae willbe corresponding points, that is, points equidistant from D(because the angles A C B, A C B being equal, D C E andD C E are also equal), and consequently when the optic axesare directed to A, an object at B will have its image formedupon the corresponding points E, E, and will be seen single. Now, when the optic axes are directed to A, a ray from Bwill fall upon the left eye at L with a greater angle of incidencethan on the right eye at R; and consequently it will strike theretina at a poin
The Philosophical magazine; a journal of theoretical, experimental and applied physics . the retinae willbe corresponding points, that is, points equidistant from D(because the angles A C B, A C B being equal, D C E andD C E are also equal), and consequently when the optic axesare directed to A, an object at B will have its image formedupon the corresponding points E, E, and will be seen single. Now, when the optic axes are directed to A, a ray from Bwill fall upon the left eye at L with a greater angle of incidencethan on the right eye at R; and consequently it will strike theretina at a point further from D in the left eye than in theright eye; that is, if the ray B R is refracted to E, the rayB L will be refracted to some point e, and consequently thelines of visible direction E C, e C will meet in a point withoutthe circle ABC. The real binocular czirve,i\\Q\e^oYe,\s every-where without the circle. Hence the doctrine of correspond-ing points is not true; and if it had been true, it would havebeen so because it was a necessary consequence of a law ofvisible 33 E in Single and Binocular Vision, 451 7. On the Vision of Cameos and Intaglios*, The beautiful experiment of converting a cameo into an in-taglio, and an intaglio into a cameo, by monocular vision, iswell known. In 1825 I had occasion to investigate this sub-ject, and in January 1826 I published an account of my ob-servations, with an ample notice of the previous labours ofother authors f. Mr. Wheatstone has ingeniously connected this opticalfallacy with the union of dissimilar images on the retina, thoughhe does not refer it to this union as its cause. After quotingmy previous explanation of the illusion, he makes the follow-ing observations upon it:—These considerations do not fullyexplain the phaenomenon, for they suppose that the image mustbe inverted, and that the light must fall in a particular direc-tion ; but the conversion of relief will still take place when theobject is viewed throu
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