[tjmc]

One of my earliest jobs as a mechanical engineer was checking the pneumatic tube shop drawings for Perth Children's Hospital. Basically looking for bends with too small a radius and appropriate collars through firewalls.

One of the engineers suggested adding a transparent loop the loop passing through the public atrium for a bit of fun but predictably this was denied.

[justinhj]

I don’t suppose you have any links to good layman articles about how these work? I am particularly interested in the early systems.

[wiradikusuma]

Any specific safety reasons?

[tjmc]

No - I think the architects just weren't fans.