Re: Tesla Coil on TV Science Show.

Two things:

> Original Poster: gweaver <gweaver-at-earthlink-dot-net> 
> Sunday morning at 8:47 am I saw a very interesting Tesla Coil on TV.  
> The Flat primary coil looked like it was 25 feet diameter on the outside.
> About 20 turns of what looked like copper tubing.  The primary looked like
> it was wound with 1/2" copper tubing spaced about 1/2" between tubes.  The
> inside diameter of the primary was about 23 feet.
> Around the inside diameter of the primary coil was 8 secondary coils.  Each
> secondary coil looked like it was about 4 or 5 feet tall with a small sphere
> on the top.  The sphere shape was about 3 or 4 inches larger than the
> secondary coil. The primary looked like it was about 2 feet above the floor.

Who built the unit?
> The secondary coils looked like they were spaced about 6 or 7 feet apart
> around the inside of the primary coil.  All 8 secondary coils were making
> streamers to each other and across the middle.  It was very impressive with
> so may streamers going in several directions from each coil all at the same
> time and 20 foot sparks across the middle.
> Sorry I can't provide any more information.  The science show flashed up
> stuff very fast on the TV screen about several different museums, each one
> lasted only about 5 seconds.  I just happened to be there at the right time
> to see it. 
> This gives me an idea.  I should be able to duplicate this on a smaller
> scale.  A flat primary coil 36" outside diameter, 1/4" copper, spaced 1/4"
> between turns, about 10 turns.  8 secondary coils evenly spaced on the
> inside of the primary coil wound on 2" or 3" pvc pipe. Small copper sphere
> in each coil.

I would think that every second coil was wound in the opposite sense 
to its neighbours to get the sparking from coil to coil. Kudos to 
whoever thought of this idea.