Stopping in on my way out, I really appreciated the chance to see this video. That's a good idea, with the rectangular notch going up to the top on the bigger tube, to slightly raise it's wind chime frequency to match the inner tube's. (At the voltage/frequency resonance.) Or, make the smaller tube longer.
I completely agree with him about absolutly not touching the white tetravalent Chromium powder. Any skin contact would be carcinic. Even after the 'bake in' hardening. Personally, I prefer to use a thin coating of zinc oxide paint - from the solar cell industry - to provide the semiconductor band gap which inhibits galvanic activity in the water. Even copper electrodes don't corrode when the positive electrode is coated. I'm going to try baking it in.
DTR
