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In page Louis Gathmann:

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By the 1880s, Gathmann had made enough money to have his family moved to the United States from Prussia.[citation needed] He also had four mansions built, two in Chicago, one in Washington D.C., and one in Baltimore, Maryland.[citation needed] 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.[3][1]