An overhead projector is made up of a base with a clear glass top housing ... A new era of creativity and collaboration in the classroom was ushered in. As with a lot of classroom tech, overhead ...

A Brief History: Roger Appeldorn created a machine that projected the image of writing on clear film in the early 1960s, while working at 3M, according to the company’s recount of the invention of the ...

Tack the black sheet to the front of the classroom to form a screen for the overhead projector. Place the overhead projector in the back of the classroom to make its image as large as possible on ...