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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. 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.

  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

    Chesapeake Bay Candle factory workers make more than a half-million scented candles each month for sale at popular retail ... make copiers and overhead projectors, and the facilities have expanded ...

  6. Slide projector - Wikipedia

    en.wikipedia.org/wiki/Slide_projector

    Slide projector light generation and collimation system: from left to right, mirror / reflector, bulb, condenser lens 1, green-tinted heat-absorbing glass, condenser lens 2; a centrifugal fan, used to cool the bulb, is visible at the top of the picture. A projector has three main optical elements: [3]: 39–40

  7. The 10 Best Projectors of 2022 for Every Budget, Tested and ...

    www.aol.com/10-best-projectors-2022-every...

    We tested dozens of projectors to find the very best projector of the year. Find options for every budget and home entertainment setup. Skip to main content. 24/7 Help. For premium support please ...

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