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An overhead projector works on the same principle as a slide projector, in which a focusing lens projects light from an illuminated slide onto a projection screen where a real image is formed. However some differences are necessitated by the much larger size of the transparencies used (generally the size of a printed page), and the requirement ...
Overhead projector in operation, with a transparency being flashed. A transparency, also known variously as a viewfoil or foil (from the French word "feuille" or sheet), or viewgraph, is a thin sheet of transparent flexible material, typically polyester (historically cellulose acetate), onto which figures can be drawn.
As copying technology advanced, Thermofax machines were subsequently marketed as a method of producing transparencies (viewgraphs) for overhead projector presentations. A sheet of heat-sensitive clear stock was placed on top of the original, and passed through a ThermoFax, producing a black image on the clear stock.
Big metal boxes with glass tops and protruding upper appendages called overhead projectors once did the heavy lifting at corporate meetings, in classrooms, at weddings and just about anywhere ...
Document cameras replaced overhead projectors, which were formerly used for this purpose. [2] A document camera can enlarge the small print in books and project a printed page as if it were a traditional transparency by using a zoom feature.
Metal leaf, a very thin sheet of decorative metal; Aluminium foil, a type of wrapping for food; Tin foil, metal foil made of tin, the direct predecessor to aluminium foil; Transparency (projection), a thin sheet of transparent flexible material, placed on an overhead projector for display to an audience
Adhesive whiteboards come in either a sheet or a roll and feature a stick back enabling the user to create a custom size board or project with the material. Although adhesive whiteboard material does not come in a thick, hard glass or painted steel plate, the melamine allows for a flexible material while preserving the high-quality whiteboard ...
Wet wipe markers were often used on overhead projector transparencies, as they could be stored and transported easily, unlike a traditional chalkboard. With the rise of computerized slide-shows (e.g. PowerPoint) in the classroom and office, overhead usage has reduced substantially, and with it, the wet wipe marker. Marks can then be cleaned off ...
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