Ed Gray had a way to generate free electricity without using his motor. At one point, he approached the electric utility company in California about selling power to them. They declined for some reason probably related to an extraneous effect his circuit produced. At that point, he asked them to just let him use his motors to power their generators, instead. And they still refused. So it seems he did have some power generating system which didn't require his motor.

I think this system is the air core transformer, or the FFF coils. I've done some tests with my arc stretching arrangement and I've noticed that after the arc is stretched around 8 or 9 inches it looks different. It's larger, more tenuous, less opaque, not so bright, and has a slight blueish tint. It looks a lot like the effect in Gray's pipe with the coils:



Unfortunately, I can't post my circuit until I upload it to my own site, copywrite it, and discuss it on some other forum. edit: Even this doesn't always work.