![]() ![]() When the transparency sheet is full of written or drawn material, it can simply be replaced with a new, fresh sheet with more pre-printed material, again saving class time vs a blackboard that would need to be erased and teaching materials rewritten by the educator. The enlarging features of the projector allow the educator to write in a comfortable small script in a natural writing position rather than writing in an overly large script on a blackboard and having to constantly hold their arm out in midair to write on the blackboard. The overhead is typically placed at a comfortable writing height for the educator and allows the educator to face the class, facilitating better communication between the students and teacher. This saves time, since the transparency can be pre-printed and used repetitively, rather than having materials written manually before each class. Teaching materials can be pre-printed on plastic sheets, upon which the educator can directly write using a non-permanent, washable color marking pen. The overhead projector facilitates an easy low-cost interactive environment for educators. Overhead projectors were widely used in education and business before the advent of computer-based projection. ![]() They were widely used in education and business before the advent of video projectors. These are placed on the glass platen of the projector, which has a light source below it and a projecting mirror and lens assembly above it (hence, ‘overhead’). In the overhead projector, the source of the image is a page-sized sheet of transparent plastic film (also known as ‘foils’) with the image to be projected either printed or hand-written/drawn. Instead of carrying your presentation on a thumb drive or CD, plan on toting along a box of transparencies, as well as a few extras tools to add depth to your talk. You may consider overhead projectors to be yesterday’s technology, but when you know you’ll be making a presentation in a facility that relies on them, you can set up an effective set of projection materials that work just as well as digitally projected output. An overhead projector (OHP), like a film or slide projector, uses light to project an enlarged image on a screen, allowing the view of a small document or picture to be shared with a large audience. ![]()
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