What Happens When You Mail a Letter in 1951.
This 1951 Popular Science article explains the journey of a letter from when it is dropped into a mailbox to its destination.
When this article was written, there was a big pneumatic tube network connecting all of the post offices in Manhattan!
I wonder how much of the system had changed: Link - Thanks Henry @ Brohans!
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I think the tubes are still there in place, at least partially. The tubes are mentioned at the US Postal Museum in DC.
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I wonder how often the system got jammed?
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