perspectoscope

Century Dictionary and Cyclopedia

1. 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.