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Overhead Projectors, Not An Antiquated Device Despite the ubiquitous presence of high-tech equipment just like laptops and LCD projectors which can be usually found in conferences and office meeting rooms these days, the former (old) technology used for presentations and lectures, overhead slide projectors remain as a common gadget for a lot of and we can still find its presence and it is common in most places. Producers of a majority of these projectors are continuously upgrading and improving this system to provide the best performance and satisfaction, this means that this simple projection technology is going to stay. An overhead projector is principally a slide projector, a slide which is a plastic transparent sheet (also called transparencies) is used to draw, write as well as print the content to be presented. When these transparent sheets are placed over the projector, the content material is projected on to a screen or surface big enough to suit the spectators. They are very simple and easy to use; the most common variety of of overhead projector consists of a light box and a reflector, the light box is composed of a light, a cooling fan and a double faced Fresnel lens which also serves as a cover of the box. The reflector that's mounted on an adjustable arm consists of a mirror and a lens to focus and redirect the light. When the slides or transparencies are positioned over the light box, the light from below passes through the slide and the reflected and enlarged image is projected onto the screen. The size of the projected figure is exactly proportional to the distance of the projecting surface and the projector. Furthermore the optimum range is between six to twelve feet. More expensive models can have even bigger projection range. There are transportable (reflecting type) projector designs. They are also available, one can find the appropriate model that matches their needs. 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