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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.
The use of transparent sheets for overhead projection, called viewfoils or viewgraphs, was largely developed in the United States. Overhead projectors were introduced into U.S. military training during World War II as early as 1940 and were quickly being taken up by tertiary educators, [14] and within the decade they were being used in ...
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.
These discs were made of thin plastic and were literally flexible, similar to an overhead projector transparency sheet. The first magazine to be circulated widely in the flexible disc format to blind individuals was U.S. News & World Report. [10]
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
It works with an overhead projector. The panel consists of a translucent LCD, and a fan to keep it cool. The projection panel sits on the bed of the overhead projector, and acts like a piece of transparency. The panels have a VGA input, and sometimes Composite (RCA) and S-Video input. Later models have remotes, with functions such as 'freeze ...
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