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What's the bottom right image of?
That is a mercury arc rectifier:
I thought you might also enjoy its German name: Quecksilberdampfgleichrichter
Sounds kinda similar to the Swedish word "kvicksilverbågelikriktare"....
EDIT: After doing some more googling, the proper name for the device in Swedish is:
"Kvicksilverlikriktare"
and sounds nothing like the hungarian "higanyív szelep" or "higanygőz egyenirányító"
Or its Dutch name:
Kwikdampgelijkrichter
Looks like cherenkov radiation?
Nope, that is a mercury arc rectifier:
That's some fuckin' 1800s steampunk adjacent shit
Oh yeah, the glass age of electronics gave us some really cool stuff!
https://en.wikipedia.org/wiki/Nixie_tube
https://en.wikipedia.org/wiki/Nimo_tube
https://en.wikipedia.org/wiki/Crookes_tube
https://en.wikipedia.org/wiki/Dekatron
https://en.wikipedia.org/wiki/Geissler_tube
https://en.wikipedia.org/wiki/Iconoscope
https://en.wikipedia.org/wiki/Magic_eye_tube
https://en.wikipedia.org/wiki/Monoscope
It shows Cherenkov radiation of a nuclear underwater reactor (I think, I don't know this exact picture)
Nope, just plain UV from the mercury arc in the rectifier: