Well before the first climbing frame was patented as "jungle gym", mathematician Charles Hinton thought they might be able to teach kids four-dimensional thinking. ■ Thanks to the Winnetka Historical Society! More from them: www.winnetkahistory.org/gazet...
Original patents referenced:
patents.google.com/patent/US1...
patents.google.com/patent/US1...
patents.google.com/patent/US1...
patents.google.com/patent/US1...
Also referenced is "Winnetka: The history and significance of an educational experiment", by Washburne and Marland.
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25 июн 2023