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2. Transparency (projection) - Wikipedia

   en.wikipedia.org/wiki/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.

3. Overhead projector - Wikipedia

   en.wikipedia.org/wiki/Overhead_projector

   The use of transparent sheets for overhead projection, called viewfoils or viewgraphs, was largely developed in the United States. Overhead projectors were introduced into U.S. military training during World War II as early as 1940 and were quickly being taken up by tertiary educators, [14] and within the decade they were being used in ...

4. Fresnel lens - Wikipedia

   en.wikipedia.org/wiki/Fresnel_lens

   An overhead projector in use. The use of Fresnel lenses for image projection reduces image quality, so they tend to occur only where quality is not critical or where the bulk of a solid lens would be prohibitive. Cheap Fresnel lenses can be stamped or molded of transparent plastic and are used in overhead projectors and projection televisions.

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6. Doctors Say This Is How You Can Loosen and Clear Mucus From ...

   www.aol.com/doctors-loosen-clear-mucus-chest...

   Try using a humidifier to “maintain humidity levels between 35-45% in your home.” He also suggests using an air purifier with HEPA filter “to remove allergens and irritants,” and keep your ...

7. High-intensity discharge lamp - Wikipedia

   en.wikipedia.org/wiki/High-intensity_discharge_lamp

   15 kW xenon short-arc lamp used in IMAX projectors. High-intensity discharge lamps (HID lamps) are a type of electrical gas-discharge lamp which produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused alumina arc tube. [1]

8. Here's How Much Every State Will Spend Per Child This Christmas

   www.aol.com/finance/heres-much-every-state-spend...

   50. South Dakota. Average price per child: $247 This article was originally published on Cheapism

9. Opaque projector - Wikipedia

   en.wikipedia.org/wiki/Opaque_projector

   The opaque projector, or episcope is a device which displays opaque materials by shining a bright lamp onto the object from above. The episcope must be distinguished from the diascope , which is a projector used for projecting images of transparent objects (such as films), and from the epidiascope , which is capable of projecting images of both ...