Post Office pneumatic tube system
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Caption: "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 miles away from the post-office, requiring thirteen miles of pipe. Relay stations on this line are at Twelfth and Twenty-second streets ...
|University of Illinois at Urbana-Champaign|
|University of Illinois at Urbana-Champaign, University Library|
|United States. Post Office (Chicago, Ill.)|
|The Loop (Chicago, Ill.)|
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