Now that would be neat. An LED-resistor pair across each capacitor, with the resistor value such that the LEDs would only light at the peaks. By varying frequency you'd see the peaks moving along the length of the line. Maybe it would work without killing the line. If it would work with one LED-resistor pair it might be neat to see one made with LEDs in every position.
With big power from the Heathkit transmitter it might be possible to get NE-2 neons to light up that way instead of LEDs.
EDIT: It works!
I was going to place neons right on top of the coils, but the resistor / led / neon across the capacitor sounds like a more controlled experiment.
You may not need that much drive with neons if your coil has a high enough Q, as the voltage can build to quite high values in the line.
Now we need to figure out how to get either a traveling wave or a series of singular pulses to travel down the line, so that in the process of transferring velocity to electrons, thus dragging electrons in a conductor placed within the line, it develops a DC current flow in the conductor.(or gas tube per the patent). The energy needs to be used up in this process before it reaches the end of the line such that there is no reflected pulse, which would just push the electrons backwards undoing the forward velocity, and no net DC in the target.
A proper termination would prevent reflections possibly at the expense of wasted power if the wave should get to the termination. See section 2 par 5, thru 15.
Another possibility: the line is formed into a ring with output tied to input and a directional coupler injects the signal. Possibly diode blocking would be enough to keep the pulse going in one preferred direction.
It will be a while before I get back on this but doing things as I am able, (tax filing, 70 1/2 RMD's. complicated!).
Just because it has a patent application or is patented does not always mean it really works.