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Tel′e-ster′e-o-scope.

An instrument described by Helmholtz, 1857, for producing an appearance of relief in the objects of a landscape at moderate distances.

It consists of a frame on which are set at a convenient distance — say 4 1/2 feet — apart two plane mirrors at an angle of 45°, which receive the rays of light from the objects; these are reflected to two central mirrors, forming an angle of 45° with the first, in which they are viewed by the eye. The effect produced is the same as if the eyes of the observer were at the same distance apart as the two larger mirrors. When objects at a great distance are viewed, they do not appear in strong relief, but rather as if detached from the general landscape. — Annales de Chemie, 3d series, Vol. LII. p. 118.

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H. Helmholtz (1)
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