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the Camera Obscura, meaning "dark room," was the first recorded use of light to project an image.
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The first recorded instance of a projected image was used by Johannes de Fontana, using a lantern and a translucent window to show the image of the devil.
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Leonardo Da vinci used this same principle to create his "Magic Lantern." this device was the precursor to the modern Projector.
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The Magic Lantern projectors were often used to summon "Ghosts," giving it a new name, "the lantern of fright."
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Magic lanterns began using Oil lamps to better display the image brightly. they were renamed "opaque lanterns" by most.
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Halogen lamps eventually replaced Oil lamps as the light source. these projectors became widely used in schools, as they were a great teaching tool. https://www.ethos3.com/2014/03/a-brief-history-of-the-projector/
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The Overhead projector replaced the opaque projector. Soldiers in WWII were trained and shown images on overhead projectors. through the 1950's and 1960's, most businesses displayed information using them.
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Following the creation of the Computer, the Microsoft company developed PowerPoint, a slide based presentation program.
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