I forgot to add that I originally did these experiments in glass tubing simply to see what was going on. After the initial success of the glass tube experiments, I had planned on going to carbon steel or stainless steel tubing with actual measurements of the amounts of nickel and copper and a quantitative record of the electric current applied to the tungsten filament. I would have electrodeposited the copper on top of the nickel instead of winding copper wire of unknown alloy composition. And of course, I would have used much higher pressure hydrogen.
Sadly, I had to stop at that time.
