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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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Subject
Astronomical Observato... (3)
Buildings (1)
Electricity (1)
Exhibition Buildings (1)
Science (1)
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2.75x2 (2)

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Museum of Science and ... (1)

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[Exterior view of the Yerkes Observatory of the University of Chicago in Williams Bay, Wisconsin.]
1. [Exterior view of the Yerkes Observatory of the University of Chicago in Williams Bay, Wisconsin.]
[The Yerkes Observatory of the University of Chicago in Williams Bay, Wisconsin.]
2. [The Yerkes Observatory of the University of Chicago in Williams Bay, Wisconsin.]
"When light beams from the star Arcturus were picked up by photoelectric tubes at four observatories,
3. "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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