Century Dictionary and Cyclopedia
- n. The trade-name of an instrument which enhances the perspective suggestion of a photograph, outline-drawing, etc., and thus simulates a stereoscopic effect. The instrument consists essentially of two observation-tubes, fitted with magnifying-lenses, and of two boxed mirrors, so arranged that a picture held in a frame at right angles to the tubes is reflected through these to the two eyes.
Science, May 6, 1898, p. 617.
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