slide projector

Device for displaying one frame of film at a time onto a surface (screen). The most common is/was the Kodak carousel Ektagraphic, which used 35mm slides and a 300W incandescent lamp.
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http://slideprojector.kodak.com/ektagraphic/e.shtml

Large-format slide projectors, most notably from Pani of Austria, used up to 5"x7" slides and up to 12kW lamps.