Hi all,
Here are some links to get you started. This is part of the secret of the Papp engine.
Easier to make than an engine, a heat source that puts out much more than put in.
http://jlnlabs.imars.com/mahg/article.htm
http://jlnlabs.imars.com/mahg/mahg1.htm
I don't know why this experiment used a heating filament? An electric arc is known to work ala the atomic hydrogen torch. I guess they were just trying to recreate Langmuir's work?
Tishatang