The next level:
Hooking up a resistor in line with the negative tube.
This will raise the limite of voltage to 8.5Volts.
The resistor will block electron flow, which sounds ok to me.
Then he states that the voltage over the tubes is not effected by this resistor....hmmmmmmm not sure on that.
Then he states: In the generation of the hydrogen and oxygen gasses to an INFINITE limit, as yet not fully appriciated?
, the upper level of amplitude of the voltage is removed with utilization of the electron inhibitor (resisitor) of fig. 7, which is a sandwich resistor.