[Bob Ireland]

You beat me to it right out of the starting gate. :) Still, with the space program and hydrogen fueled cars, I suppose the situation has improved... (NO SMOKING!)

[amorphous]

NO SMOKING!

Lol, right you are and should be a placard requirement for every side of this machine.

[amorphous]

After researching the hazards of liquid hydrogen, I stand corrected. It's not as hazardous as I first assumed, at least outside of an enclosed environment.

Below is a short video from a AF contracted study from the 60's.

~ ~ ~

Experimental Investigation of Liquid Hydrogen Hazards, 1960, Film Number 1

https://www.youtube.com/watch?v=7bFJK5kU_UQ