[Perspex cover on a demonstration PDP8/e)
It's primarily to protect the machine from the
observers, not v.v.
Secondarily, it's to protect the exhibitors from H&S idiocy.
Ah, that makes a lot of sense.
And the second point iws what bothers me, actually, As I've said, if
somebody is silly enough to stick their fingers in a working machine,
they deserve a Darwin Award. Alas the HSE doesn't see it that way :-(
-tony