In article , Alaric B Snell says...

The department had got a new NMR machine. An NMR machine is a big
superconducting coil, in liquid nitrogen,

Helium, really.

But a kid was killed recently around here, he was in an
NMR (aka, MRI) machine and a tech brought an O2 bottle in
the room because the oxygen line to the kid was getting
flow troubles.

Wrong bottle. It flew into the machine and crushed
the kid's head.

We used to have one magnet (ten tesla) and there was
a paperclip on a string in the pit underneath it, hung
about five feet away from the dewar. As a tell-tale
to say when the magnet was up. When it was, the paperclip
pulled the string straight out, you could twang the string.

Jim

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