Pneumatic tubes were used to deliver mail!
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
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
!technology
Technology for a Solar-Punk future.
Airships and hydroponic farms...
In the medicine field this technology isn't uncommon because you can send samples quickly to the hospital laboratory.