epidiascope
/ˌɛpɪˈdaɪəˌskoʊp/
noun
- A device that projects images of both opaque objects (like pages of a book) and transparent slides onto a screen.
- The museum displayed old photographs using an epidiascope during the special exhibit.
- Before digital projectors, the epidiascope was common in lecture halls.
- The teacher used an epidiascope to show the class a page from a rare manuscript.