An overhead projector is a variant of slide projector that is used to display images to an audience.
Read more about Overhead Projector: Mechanism, History, Decline in Use
Famous quotes containing the word overhead:
“What a fog! Plane been buzzin’ around overhead for the last half hour. Must be like trying to find your way through the inside of a cow. I never did see such a country. Even the birds are walkin’.”
—Dalton Trumbo (1905–1976)