
1) English invention 2) Its depth is illusory 3) Optical device 4) Optical device
Found on
https://www.crosswordclues.com/clue/stereoscope

A stereoscope is a device for viewing a stereoscopic pair of separate images, depicting left-eye and right-eye views of the same scene, as a single three-dimensional image. A typical stereoscope provides each eye with a lens that makes the image seen through it appear larger and more distant and usually also shifts its apparent horizontal position...
Found on
http://en.wikipedia.org/wiki/Stereoscope

instrument for viewing special three-dimensional photographs
Found on
http://phrontistery.info/s.html

• (n.) An optical instrument for giving to pictures the appearance of solid forms, as seen in nature. It combines in one, through a bending of the rays of light, two pictures, taken for the purpose from points of view a little way apart. It is furnished with two eyeglasses, and by refraction or reflection the pictures are superimposed, so as t...
Found on
http://thinkexist.com/dictionary/meaning/stereoscope/

A 19thC instrument for viewing two drawings or photographs of the same object, pictured at slightly different angles, to produce a single, three-dimensional image. It was invented by British scientist Charles Wheatstone in 1838.
Found on
http://www.antique-marks.com/antique-terms-s.html

(from the article `stereoscopy`) ...to the right eye and the left-eye image to the left. An experienced observer of stereopairs may be able to achieve the proper focus and ... Stereoscopic photographic views (stereographs) were immensely popular in the United States and Europe from about the mid-1850s through the early ... His own in...
Found on
http://www.britannica.com/eb/a-z/s/160

<instrument> An optical instrument for giving to pictures the appearance of solid forms, as seen in nature. It combines in one, through a bending of the rays of light, two pictures, taken for the purpose from points of view a little way apart. It is furnished with two eyeglasses, and by refraction or reflection the pictures are superimposed, ...
Found on
http://www.encyclo.co.uk/local/20973

(ster´e-o-skōp″) an instrument for producing the appearance of solidity and relief by combining the images of two similar pictures of an object.
Found on
http://www.encyclo.co.uk/local/21001

A 19thC instrument for viewing two drawings or photographs of the same object, pictured at slightly different angles, to produce a single, three-dimensional image. It was invented by British scientist Charles Wheatstone in 1838.
Found on
http://www.encyclo.co.uk/visitor-contributions.php
Ste're·o·scope noun [
Stereo- +
-scope .] An optical instrument for giving to pictures the appearance of solid forms, as seen in nature. It combines in one, through a bending of the rays of light, two pictures, taken for the purpose from points of view a little way apart. It is furnished w...
Found on
http://www.encyclo.co.uk/webster/S/194

Type: Term Pronunciation: ster′ē-ō-skōp Definitions: 1. An instrument producing two horizontally separated images of the same object, providing a single image with an appearance of depth.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=84929

A stereoscope is an optical instrument producing an impression of depth or solidity. As early as the 1930s the technique of 3-D films shown to an audience wearing stereoscopes of a red glass filter for one eye and a green glass filter for the other eye were common in Britain.
Found on
http://www.probertencyclopaedia.com/browse/GS.HTM

[
n] - an optical device for viewing stereoscopic photographs
Found on
http://www.webdictionary.co.uk/definition.php?query=stereoscope
noun an optical device for viewing stereoscopic photographs
Found on
https://www.encyclo.co.uk/local/20974

an optical instrument through which two pictures of the same object, taken from slightly different points of view, are viewed, one by each eye, producing the effect of a single picture of the object, with the appearance of depth or relief.
Found on
https://www.infoplease.com/dictionary/stereoscope
No exact match found.