Digitization project of 21 lantern slides discovered at a flea market outside of Moscow, Russia.
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A projector much like this one would be used to present these slides to an audience.
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These slides are kind of "PowerPoint" presentation given to the Soviet people about how to react in the case of a nuclear attack.
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8 x 8 cm glass plates are held together by paper tape, with photosensitive material between them. They act like "positives", or larger versions of paper mounted carousel slides.