1) Optical device
Found on
https://www.crosswordclues.com/clue/cheiroscope
A cheiroscope (also: chiroscope) is an optical device consisting of a viewing instrument equipped with a drawing pad, with the viewing instrument set up as a haploscope that blends a left and/or right image into view over the drawing. The cheiroscope was presented in an article published in 1929. The author E. E. Maddox writes that compared to the...
Found on
http://en.wikipedia.org/wiki/Cheiroscope
cheiroscope, chiroscope A haploscopic device that permits a detail seen by one eye to be traced under control of the other eye. A haploscope is a device that presents a separate picture for each eye.
Found on
http://www.wordinfo.info/words/index/info/view_unit/438/4
No exact match found.
