Given that the previously observed radio noise seemed to be present mostly at very high frequencies, I tried doing a quick test today by forming and undoing a small temporary 5-turns air coil to the cathode wire while the cell was operating at about 11 amperes with the same arrangement as previously used, to check for any change.
Apparently when the coil was formed an enhancement in the FM radio noise produced followed, but it still retained its broadband (i.e. random) quality. In the video, the radio (off-screen, to the right) had its antenna extended to touch the jar near the anode and was set to the FM range at 108 MHz.
I'm not entirely not sure of what to make of this. I couldn't determine whether this was a real enhancement or just the result of a fortuitous alignment of the electromagnetic field generated with the antenna of the FM radio. For what it's worth, I tested it a few times under different positions and it seemed to be a reproducible effect.
I have some here, the brittle nature and speed with which they corrode suggests they are plain carbon steel.
Yep, nothing fancy. By the way, in my case most of the corrosion occurred when I ran electrolysis with no electrolyte. Under the currently relatively strongly alkaline electrolyte very little corrosion and oxidation occurs. If temperatures could be kept in check, the electrodes could probably run at least for hours continuously, possibly days. Under my testing conditions I couldn't run previous ones in an acidic electrolyte for more than a few minutes without short-circuits occurring.
I have been studying "exclusion zone water" and the whole Brown's Gas subject, and the following is the test I would like to do if I had the money or the space, which I don't. [...]
If it wasn't clear from the videos, I'm doing near zero-cost testing with no suitable space (but I don't have the guts to try igniting the gases produced by the cell here).