Wheatstone stereoscope

Wheatstone stereoscope

[¦wēt‚stōn ′ster·ē·ō‚skōp]
(optics)
A type of stereoscope that uses plane mirrors to enable the eyes to form a fused image of two pictures whose separation is greater than the interocular distance.
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A Wheatstone stereoscope uses two mirrors mounted at 90[degrees] to each other.
Furthermore, stationary examples of these types of pictures have been around since Victorian times (Wheatstone stereoscopes), and films have been around since the craze for them in the 1950s.