Stereopticon

Full definition of stereopticon

Noun

1. A magic lantern, especially one with two projectors arranged so as to produce dissolving views or combinations of images.
• 1898, Winston Churchill, The Celebrity Chapter 1, The stories did not seem to me to touch life. … They left me with the impression of a well-delivered stereopticon lecture, with characters about as life-like as the shadows on the screen, and whisking on and off, at the mercy of the operator.