I guess I could have said the potential "moves" through both branches, but remember I don't have any training in classical nomenclature.
And the grids' discharge HAS to be non-classical for there to be such tremendous energy gain.
Gray used more than one grid, each of which would have a different potential due to differences in surface area.
It is remarkable however that the distance will be crossed at the voltages used in the circuit and that different distances occur.
The nature of this process is the true unknown part of the functionality.
I think carbon acts as a negative resistor only when it's one or two atoms thick. Gray's carbon rod shown in the patent doesn't touch the arc. (As with Naudin's work.)
Naudin (who replicated her) had many layers of the material.
However, it is speculative if that phenomenon would play any role in gray´s device.
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