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In page Louis Gathmann:
By the 1880s, Gathmann had made enough money to have his family moved to the United States from Prussia. He also had four mansions built, two in Chicago, one in Washington D.C., and one in Baltimore, Maryland. Gathmann was very interested in astronomy and had three observatories built in the Chicago area during the 1880s, one of which was a domed observatory tower which he had installed on the side of his mansion on Lincoln Avenue.
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