XLII.—On the Conversion of Relief by Inverted Vision

David Brewster

doi:10.1017/S0080456800030234

Extract

Under the name Conversion of Relief, an expression first used by Mr Wheatstone, I include all those optical illusions which take place in the vision of cameos and intaglios, of elevations and depressions, whether they are produced with opaque or transparent bodies,—on surfaces with or without shadows,—in reflected or transmitted light,—while using one or both eyes,—or by erect or inverted vision. In these various forms of the phenomenon, the illusion is modified by certain secondary causes, which were regarded both by Mr Wheatstone and myself as primary causes; so that we were led away, each in a different direction, from the right path of inquiry.

References

^{page 657 note *} Phil. Trans., 1838, pp. 383, 384.

^{page 657 note †} Edin. Trans., Vol. xv. p. 365; Edin. Journal of Science, Vol. iv. p. 97; and Letters Natural Magic, p. 98.

^{page 659 note *} The inversion of an object never makes the nearer part of an object more remote, nor the remote part nearer.

^{page 661 note *} In examining, under the microscope, the shallow fluid cavities within the substance of a film of sulphate of lime, described in the Edinburgh Transactions, vol. x. p. 35, they frequently appeared as elevations on the surface of the plate next the eye.

^{page 661 note †} Edinburgh Journal of Science, No. VIII. p. 109, Jan. 1826.

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