Realpneumo.jpg (download)‎ (389 × 422 pixels, file size: 98 KB, MIME type: image/jpeg)

A central mail station of a real pneumo mail system.  Many such systems had tubes only about 3 inches across (for letter sized transport).  The problem with larger sizes was weight, and whichever size was chosen there still would be countless packages that would not fit (and could be subject to damage).

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current12:47, November 10, 2014Thumbnail for version as of 12:47, November 10, 2014389 × 422 (98 KB)Testxyz (wall | contribs)A central mail station of a real pneumo mail system

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