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2. Overhead projector - Wikipedia

   en.wikipedia.org/wiki/Overhead_projector

   Overhead projectors were used early on for police work with a cellophane roll over a 9-inch stage, allowing facial characteristics to be rolled across the stage. [ citation needed ] As the demand for projectors grew, Buhl Industries was founded in 1953, and became the leading US contributor for several optical refinements for the overhead ...

3. Things Boomers Took for Granted That are Obsolete Now

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

   There are still some answering machines left in service, but they are the last of their kind. RG-vc/istockphoto. Slide Projectors. 1849-2000s ... Overhead Projectors. Early 1960s-2015

4. List of obsolete technology - Wikipedia

   en.wikipedia.org/wiki/List_of_obsolete_technology

   Still used by some Internet enthusiasts. LaserDisc: Compact disks, DVDs, and Blu-ray: Playback of older or archived recordings. Overhead projector and slide projector: Video projector: Primarily for continued use of older materials. Some teachers find the overhead projector more convenient for lectures depending on their teaching style.

5. Projector - Wikipedia

   en.wikipedia.org/wiki/Projector

   Video projectors are digital replacements for earlier types of projectors such as slide projectors and overhead projectors. These earlier types of projectors were mostly replaced with digital video projectors throughout the 1990s and early 2000s, [1] but old analog projectors are still used at some places. The newest types of projectors are ...

6. How Classrooms Have Radically Changed Since You Were a Kid - AOL

   www.aol.com/classrooms-radically-changed-since...

   Invented by 3M in the early 1960s, overhead projectors and transparencies quickly became a core teaching tool in classrooms across the country. But 3M discontinued its iconic product in 2015.

7. 73 Brands That Are Still Made Right Here in the USA - AOL

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

   The plant was once used to make copiers and overhead projectors, and the facilities have expanded to focus on the adhesive notepads since 1985. Amazon Pyrex Glassware

8. 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 ...

9. 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.