rescla

joined 1 year ago
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They are watching in c/lemmyshitpost@lemmy.world
[–] rescla@feddit.nl 16 points 11 months ago* (last edited 11 months ago) (1 children)

The bottom right one looks like a mercury arc valve: https://en.m.wikipedia.org/wiki/Mercury-arc_valve It reminded me of an old Photonicinduction video https://youtu.be/QY6V2syGnZA