stereopticon

[ster-ee-op-ti-kuhn, -kon, steer-]
noun Optics.
a projector usually consisting of two complete lanterns arranged so that one picture appears to dissolve while the next is forming.

Origin:
1860–65, Americanism; stere(o)- + Greek optikón (neuter) optic

stereoptican, adjective
stereoptician [ster-ee-op-tish-uhn, steer-] , noun
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World English Dictionary
stereopticon (ˌstɛrɪˈɒptɪkən, ˌstɪər-)
 
n
a type of projector with two complete units arranged so that one picture dissolves as the next is forming
 
[C19: from stereo- + Greek optikon, neuter form of optikosoptic]

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Example sentences
The source of illumination shall be a lamp or a type listed for stereopticon
  use or for motion picture projection.
The above scene can be illustrated either by a soloist, quartette or with an
  orchestra, and with or without stereopticon slides.
All the parts are studied by aid of the stereopticon and sectional parts.
The formal lectures were all illustrated with stereopticon views.
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