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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.
Therefore, the transparency is placed face up (toward the mirror and focusing lens), in contrast with a 35mm slide projector or film projector (which lack such a mirror) where the slide's image is non-reversed on the side opposite the focusing lens. A related invention for enlarging transparent images is the solar camera.
a snow effect slide can add snow to another slide (preferably of a winter scene) by moving a flexible loop of material pierced with tiny holes in front of one of the lenses of a double or triple lantern. [65] Mechanical slides with abstract special effects include: Slide with a fantoccini trapeze artist and a chromatrope border design (c. 1880)
A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens, but some newer types of projectors can project the image directly, by using lasers.
PARIS (Reuters) -Iran's acceleration in its enrichment of uranium to close to bomb grade is "extremely serious", has no civilian justification and contradicts Tehran's assertions on wanting ...
The NFL will not fine or suspend Cleveland Browns quarterback Deshaun Watson again for the most recent sexual assault allegations against him. "The matter is closed," a league spokesman told the ...
Katie Holmes is setting the record straight about her daughter Suri Cruise's finances.. On Sunday, Dec. 8, Holmes, 45, shared a post on Instagram disputing a report from the Daily Mail that ...
A slide show in Germany. A slide show, or slideshow, is a presentation of a series of still images on a projection screen or electronic display device, typically in a prearranged sequence. The changes may be automatic and at regular intervals or they may be manually controlled by a presenter or the viewer.