Peter Davey Heater

[edelind]

The octave (50Hz, 100Hz, 200, 400, 800, 1600) I think are the strongest resonant relationships but you also have the minor 3rd and 5th overtones that are strong.

Somehow when I connect the microphone to my laptop and the charger is plugged in, it starts to oscillate exactly to the mains frequency. The thing that I notices is that indeed you're right and the 3rd and the 5th overtones are the most powerful (it's the first time I understand what you said :-) ).
I attached the print screen to witness.

[forest]

@nul-points
Also notice that the boiling actually starts when the top bell hits the water. So that's an electrode too

Good point! I think that electrodes may be placed in such combination:
- center one (not visible)   bell - first phase of AC
- cover spherical - neutral ground (safety device)
- outer one  -deflector - second AC phase - carefully insulated and placed above neutral with a gap between them

[storre]

@edelind:

Looking at your spectrum analyzer I would say your mains are 50Hz? Is that right?

[edelind]

@edelind:

Looking at your spectrum analyzer I would say your mains are 50Hz? Is that right?

Yes. I was wrong saying it is 56Hz (old uncalibrated oscilloscope ). It's 50Hz sharp.

[forest]

If I'm right and both phases are separated by neutral cover then there is probably a big gap between them and a little water path because of small holes in neutral cover. I would suspect very low amperage usage then...