pneumatic post
noun1
A postal service delivering messages through pneumatic tubes.
- Long before email and SMS, the pneumatic post was the quickest way to send a written message of condolence, a declaration of love or even a demand for ransom. Systems for delivering messages through tubes by the force of compressed air originate in experiments undertaken by George Medhurst and William Murdoch at the turn of the nineteenth century.2021, Jacob Paskins, “Pneumatic Postal System”, in Barbara Penner, Adrian Forty, Olivia Horsfall Turner, Miranda Critchley, editors, Extinct: A Compendium of Obsolete Objects, Reaktion Books, →ISBN, page 253: