You can read more about the fascinating history here: https://about.usps.com/who-we-are/postal-history/pneumatic-tubes.pdf
Credit: https://hachyderm.io/@miah
this post was submitted on 27 Jun 2023
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Solarpunk technology
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Technology for a Solar-Punk future.
Airships and hydroponic farms...
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More steampunk than solarpunk, but yeah always interesting to read some details about complex but mostly forgotten technology.
In the medicine field this technology isn't uncommon because you can send samples quickly to the hospital laboratory.