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Re: Coil at Frys


For those that can't see it in person...

This coil was built by Tesla Technology Research and is pictured at their
web site:

http://www.ttr-dot-com/Fry-coil.htm

It is a reproduction of the Griffith Observatory coil.  Details can be
found at:

http://www.ttr-dot-com/Griffith/griffith.html

I ran across this site last night so I recognized it...

I assume Bill Wysock is the builder.  He is pretty good at making coils :-)

	Terry




At 09:28 PM 5/10/99 -0700, you wrote:
>Hi ...
>
>For those in the SF Bay area there is a very nicely built
>coil at Frys Electronics new store at 680 and Automall
>Pky ( formerly Durham Rd. ) in Fremont. Entrance off of
>Osgoode. If you talk to a salesman they'll get someone
>to turn it on for you.
>
>I guess it was built to emphasize historical accuracy over
>raw performance .
>
>The secondary is conical, about 3 feet in diameter at the
>bottom, and a foot or so at the top, wound with around
>300 turns of quite heavy space wound wire. A foot above
>the top is a copper sphere also about a foot in diameter
>with two discharge points arranged diametrically opposite
>each other.
>
>Primary is 2 inch or so copper strip, nicely polished, as is
>the capacitor - gap - coil connections. Seems to be tapped
>around turn four.
>
>The gap is a really pretty rotary driven by a cogged belt
>from a motor hidden underneath.
>
>It's in a Faraday cage made from heavy chain link and built
>into a gazebo.
>
>Makes fairly strong connected arcs to the chain link probably
>4 feet away, easily visible in the well lit store. The inside of
>the gazebo is black, which helps.
>
>When a keyswitch is turned it starts up a little while later
>for a few seconds (10 or 15 or so).The  guy who had the
>key didn't know who made it, but the workmanship is superb.
>Someone put a lot of time on  this one.
>
>LR
>
>
>
>