How does this work

I wouldn't get too fooled with this. It looks like a simple electrolosis system BUT the power to operate it outweighs the Hydrogen obtained. It also produces oxygen

you bored Mad Dog??

Hydrogen = bang ,oxygen required for bang , 2parts hydrogen+1part oxygen= water = no bang ,run a car on water = no go ,if he was still alive you could ask ex premier Joh.

Those copper coated carbon electrodes are from an arc lamp as used in old film projectors, searchlights etc.

Any old bit of copper or zinc would do the same job if put in water and connected to a battery. As already explained above you will get oxygen (bubbles) at one electrode and hydrogen (bubbles) at the other electrode. Now comes the big problem, how do you collect these (very small) bubbles in a container and then feed it into your engine. One possibility would be to pump it into a huge balloon on the roof of your truck. Might even reduce the weight of the vehicle if you carried enough of it :-))

Only way to make money or save money would be by selling to other poor unsuspecting fools Caveat emptor

Unles you had a compressor to compress the hydrogen gas into workable volumes it would be useless.

"A fool and his money are soon parted"

Guess we will soon be seeing a Tojo tripping around Oz with copper rods sticking out from all over it looking like an Echidna with a bluddy great fan on the back to push it along , well that's the picture it conjures up in my mind ,