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...of glass 'magic lantern' slides. There were 5 photographic slides in it, all marked as taken by [[Juul-Ingersoll Company]], St. Paul MN. According to t ==The Images==

** it may sound nice to use a 22MP DSLR to take the frame images, but there's a bunch of issues here: ...t 50MB per second. That's a pretty big camera card to hold 10min of those images, also figuring in saving time to write to the camera card.