When was the Overhead Projector invented?

raman   December 23, 2011   Comments Off on When was the Overhead Projector invented?

The Overhead Projectors were invented in the early 1960s by Roger Appledorn. In the late 1800s the opaque projector was developed and from non transparent materials such as drawings and books it projects information. To exhibit images to the audience the overhead projector is used which is a variant of slide projector.

Overhead Projector