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2. Overhead projector - Wikipedia

   en.wikipedia.org/wiki/Overhead_projector

   An overhead projector (often abbreviated to 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. In the overhead projector, the source of the image is a page-sized sheet of transparent plastic film (also known as "viewfoils ...

3. Slide projector - Wikipedia

   en.wikipedia.org/wiki/Slide_projector

   A slide projector is an optical device for projecting enlarged images of photographic slides onto a screen. Many projectors have mechanical arrangements to show a series of slides loaded into a special tray sequentially. 35 mm slide projectors, direct descendants of the larger-format magic lantern, first came into widespread use during the ...

4. Projector - Wikipedia

   en.wikipedia.org/wiki/Projector

   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. A virtual retinal display, or retinal ...

5. Transparency (projection) - Wikipedia

   en.wikipedia.org/wiki/Transparency_(projection)

   Transparency (projection) 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.

6. Things Boomers Took for Granted That are Obsolete Now

   www.aol.com/things-boomers-took-granted-obsolete...

   Slide Projectors. 1849-2000s ... Big metal boxes with glass tops and protruding upper appendages called overhead projectors once did the heavy lifting at corporate meetings, in classrooms, at ...

7. Visual communication - Wikipedia

   en.wikipedia.org/wiki/Visual_communication

   These include slide projectors, overhead projectors, and computer projectors. Slide projectors are the oldest form of projector, and are no longer used. Overhead projectors are still used but are somewhat inconvenient to use. In order to use an overhead projector, a transparency must be made of whatever is being projected onto the screen.