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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. Things Boomers Took for Granted That are Obsolete Now

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

   Easy to store and easy to use, filmstrips were a practical alternative to 35mm films. By the 1980s, however, compact and efficient video players, including VHS, rendered filmstrip projectors obsolete.

4. Transparency (projection) - Wikipedia

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

   Many overhead projectors are used with a flat-panel LCD which, when used this way, is referred to as a spatial light modulator or SLM. Data projectors are often based on some form of SLM in a projection path. An LCD is a transmissive SLM, whereas other technologies such as Texas Instrument's DLP are reflective SLMs. Not all projectors use SLMs ...

5. 73 Brands That Are Still Made Right Here in the USA - AOL

   www.aol.com/73-brands-still-made-usa-123000180.html

   $1,600 and up from Best Buy Shop Now Available on eBay. The appliance company that first introduced professional-grade oven ranges still makes all its ovens, refrigerators, and other products in ...

6. Liquid light show - Wikipedia

   en.wikipedia.org/wiki/Liquid_light_show

   Shows could be as simple as a single operator and two or three modified slideprojectors or overhead projectors and a couple of color wheels or as complex as shows with ten or more operators, 70 plus projectors (including liquid slide, liquid overhead, movie and still image models plus a vast array of highly advanced (for the time) special ...

7. Slide cube projector - Wikipedia

   en.wikipedia.org/wiki/Slide_Cube_projector

   The Slide Cube Projector is a slide projector and system, manufactured and marketed by Bell & Howell, which was introduced in 1970 and marketed through the 1980s.The projector derived its name from its transparent cubical plastic slide storage magazine, approximately 5.5 cm (2.2 in) in each dimension (a bit larger than a standard 135 film slide mount), that held 36 to 44 slides, depending on ...