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2. Overhead projector - Wikipedia

   en.wikipedia.org/wiki/Overhead_projector

   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 ...

3. Document camera - Wikipedia

   en.wikipedia.org/wiki/Document_camera

   The first document camera, also known as a visualizer, was developed by WolfVision and Elmo and launched at the Photokina Trade Fair in 1988. [4] [5] The widespread use of computers, projectors, and popular presentation programs such as Microsoft PowerPoint in meeting rooms led to overhead projectors being used less frequently. [citation needed]

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 .

5. Bell & Howell - Wikipedia

   en.wikipedia.org/wiki/Bell_&_Howell

   35mm filmstrip projectors; Overhead presentation projectors (all models) Stereo cameras and stereo slide projectors through its TDC subsidiary; Slide Cube Projector, circa 1970; In 1934, Bell & Howell introduced their first amateur 8mm movie projector, in 1935 the Filmo Straight Eight camera, and in 1936 the Double-Run Filmo 8.

6. Projector camera systems - Wikipedia

   en.wikipedia.org/wiki/Projector_Camera_Systems

   Projector-camera systems may also be used for artistic and entertainment purposes. [2] A pro-cam system consists of a vertical screen for implementing interpersonal space where front-facing videos are displayed, and a horizontal projected screen on the tabletop for implementing shared workspace where downward facing videos are overlapped.

7. Category:Projectors - Wikipedia

   en.wikipedia.org/wiki/Category:Projectors

   Polylux (overhead projector) ... Projector camera systems; Projector phone; T. Talaria projector; Theatrograph; Throw (projector) V. Victor Animatograph Corporation;