[9422WMR]

Mercury made great switch contacts. I use to rob the glass vials from old mercury switches and put the mercury in a glass bottle. Fun stuff.

[Worldtraveler once upon a time]

--- "...rob the glass vials from old mercury switches and put the mercury in a glass bottle...."

It must be in an engineer's / scientist's DNA. Non-eroding contacts. We too did that and similar things. Cheers!

Available in minis... https://www.amazon.com/Midzooparts-Mercury-Switch-Sensor-Unidirectional/dp/B09P47DY3C/ref=sr_1_3?keywords=Mercury+Switch&sr=8-3

And metal-wrapped... https://www.newark.com/durakool/4859/tilt-switch/dp/99F5659

[Pox]

Did the same back in the 70’s, and took it to school, and a teacher used it as a prop one day for teaching about mercury.

Surprised I haven't gone mad as a hatter by now!