related tags: 1E1515 483A3C 4F3336 67615D 6C6058 8F8271 B8B5B1 BBB5AE aperture astronomy blue brick catwalk dome georgeelleryhale greatrefractor henryivescobb mechanism open opening slit stairs sun telescope tower universityofchicago yerkesobservatory 1897 231011 878178
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