The story
From βάλλω (bállō, “throw”) + ὀπτικός (optikós, “visual”). At the same time it reflects the initials of the company Ba(usch) & L(omb) Optical.
Etymology from Wiktionary, CC BY-SA 4.0.
balopticon
Today it means: An early kind of stereopticon or projector. Full definition →