The Franklin Institute Science Museum in Philadelphia, PA has a large
communications exhibit with two stations on either end.  Visitors can
communcate with friends on the opposite station using various means.
 
One way they can talk to each other is by typing and sending their letter
through an air transport tube.
 
Does anyone know of a ready-made or plans for a build it yourself
typewriter that can stand up to the rigors of extensive visitor use/abuse?
 
 
Michael Moulton
Exhibit Developer
IIS
TFI