What is an Overhead Projector?
An overhead projector is a very basic but reliable form of projector. The overhead projector displays images onto a screen or wall. It consists of a large box containing a cooling fan and an extremely bright light, with a long arm extended above it. At the end of the arm is a mirror that catches and redirects the light towards the screen. An overhead projector can be used to enlarge images onto the screen or wall for audiences to view. Transparencies can be placed onto the projector to be viewed by both the audience and the speaker. The overhead projector was once a common feature in both classrooms and business meetings. Recently, it has seen a decline in use, as more sophisticated computer based projectors are favored. The overhead projector was first seen during World War II. It was used as a tool to train large numbers of servicemen. In the 1950s and 60s, it crossed over into the classroom as an educational tool, and then into the business world as a training tool. The overhead pro
The overhead projector is probably one of the most versatile and useful visual aids that has been made available to the modern day lecturer. The overhead projector has long since replaced the traditional chalkboard as one of the main teaching aids and is used in lecture theaters and classrooms all over the world.
