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 ...

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 ...

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 ...

When I walked into my first classroom at Great Plains Technology Center as a nervous young welding instructor in 1980, bell-bottoms and long hair were in fashion, the height of ...

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 ...