The magic lantern or laterna magica is an early type of image
projector employing painted pictures or photographs on sheets of glass, a
lens, and a bright light source. It was mostly developed in the 17th
century and commonly used for entertainment purposes. It was
increasingly applied to educational purposes during the 1800s and was in
wide use until the mid-20th century, when a smaller-format version for
photographs on film, marketed and commonly known as a slide projector,
superseded it.
The mathematic Christian Huygens used it to show his
phisic and astronomic schemes, mean while Étienne G. Robert projected
monsters "throwing itselfs over the people"...
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