1) Optical device
Found on
https://www.crosswordclues.com/clue/zograscope
A zograscope is an optical device for enhancing the sense of depth perception from a flat picture. It consists of a large magnifying lens through which the picture is viewed. Some models have the lens mounted on a stand in front of an angled mirror (Figure 1). This allows someone to sit at a table and to look through the lens at the picture flat o...
Found on
http://en.wikipedia.org/wiki/Zograscope
optical device for viewing stereoscopic images
Found on
http://phrontistery.info/z.html
No exact match found.
