3 ms·
This doesn't answer your question, but Manhattan used to have a pneumatic tube system: https://en.wikipedia.org/wiki/Pneumatic_tube_mail_in_New_York_City https:
by eurleif 12y ago
This doesn't answer your question, but Manhattan used to have a pneumatic tube system: https://en.wikipedia.org/wiki/Pneumatic_tube_mail_in_New_York_City https://en.wikipedia.org/wiki/Pneumatic_tube_mail_in_New_Yor...
- johan_larson 12y agoI saw a pneumatic tube system in operation as late as the 1990s. The main library in Madison, WI used one for communication between the main floor and secondary storage in the basement.