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University of Illinois at Chicago Century of Progress World's Fair, 1933-1934 (University of Illinois at Chicago)
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"When light beams from the star Arcturus were picked up by photoelectric tubes at four observatories,
1. "When light beams from the star Arcturus were picked up by photoelectric tubes at four observatories, signals flashed on this display board on the rostrum of the Hall of Science to the show the audience how the official lighting of A Century of Progress was accomplished."
   
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