University Library, University of Illinois at Urbana-Champaign

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Post Office pneumatic tube system

  • Post Office pneumatic tube system
    Image | 1906 | Picture ChicagoCaption: "End of the big pneumatic tube system in the basement of the Chicago Post Office." From text: "The underground pneumatic tube system is the largest of the kind in the world. There are three double-tube trunk lines, aggregating over eighteen miles of eight-inch cast iron pipe. Of these lines the stockyards branch is the longest, the station being six and one-half ...