Below are some pictures of the discharges produced by the TC. The quality
isn't too good as the discharges are very dim - no fat, bright sparks like the
ones produced by higher-powered TCs, but much diffuse corona. But once the eyes
have adapted to the darkness, the discharges are very beautiful and interesting...and
produce very much ozone...
The maximum spark length is about 7cm.
Picture of the corona surrounding the toroid.

A grounded electrode is held away from the toroid far enough to prevent sparks from forming.

Now the electrode is brought a little closer...

Here a piece of wire was put on top of the toroid.