Educators thoroughly embraced overhead projectors as a “controllable blackboard or bulletin board,” a 1967 research paper reports. A new era of creativity and collaboration in the classroom was ...

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 ...

the overhead projector enabled our teachers to display their handwritten notes and presentations onto the walls of a darkened classroom. Making their words big enough for all to see, with that ...