Fascinatingly energetic devices

nztyke

Some of the devices that I've taken an interest in and, I feel, have not been used to their full potential are:

• The Multipactor developed by Philo Farnsworth, one of the most brilliant inventor/engineer ever to exist. (Multipaction is considered a detrimental effect in RF engineering. Can these effects be harnessed?)
• The Geiger–Müller tube (used mainly as a detector but I think could be used as an energy converter )
• The Pulsed Abnormal Glow Discharge device developed by Paulo & Alexandra Correa (Seems to be a lot of scientism around this device though)

Anyone have some thoughts on these above or any others?