Experimental equipment that connects electrodes to do something

It's a glass device with a shape reminiscent of the monster "Kanegon" from Ultraman. I vaguely understand that it contains a stone and that something happens when you connect the electrodes, but I don't know the details, including its name. If anyone knows, please let me know.

The letters "TOKYO NAKAMURA" and "KM" are written on one side of the glass, and it was apparently used at the school, just like the radiometer .

There is a slight cloudiness on the inside and outside of the glass, but no other noticeable damage.

Size: Height approx. 18.5cm, base diameter approx. 9.5cm

Delivery
80 size

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Miscellaneous goods , figures, ornaments , and other miscellaneous goods