Re: Toroid = shorted turn ?Experiment:

• To: tesla-at-pupman-dot-com
• Subject: Re: Toroid = shorted turn ?Experiment:
• From: Teslaman-at-aol-dot-com (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Fri, 09 Oct 1998 22:19:55 -0600
• Approved: terryf-at-verinet-dot-com

In a message dated 10/9/98 5:56:40 PM Central Daylight Time, tesla-at-pupman-dot-com
writes:
  All,

  Here's an experiment for everyone to try (with wife's permission or when
she's not around).
  Take a foil bake cup, as used for cup cakes, and place in microwave on high
(toroid with center).  Note that nothing happens.  Now cut out just the bottom
of the cup leaving a foil ring (toroid with no center)  Pop in microwave and
note all the sparks from being a shorted turn.  A neat demonstration even
though the R.F. is applied in a different manner as a Tesla Coil.  An old
microwave is suggested for experiments.

Kevin E.

> 
>  >Yes, Wild Bill Emery and I had a problem with a small toroid on the bottom
>  >of an 
>  >"extra" coil which over-heated.  The toroid had no center aluminum disk, 
> and 
>  >formed an excellent shorted turn.  We removed the toroid and found that
>  >output 
>  >spark length increased about 10%.  It is very likely that if the toroid
had
>  >had a 
>  >solid conductive disk in the center it would not have been so troublesome,
>  
>  
>  Right. It *looks* like a turn, but if there's a conductive center disk,
>  it's *electrically* just a lump of metal as far as the coil's concerned.
>  (Electostatic field-shaping effects notwithstanding :)
>  
>  
>  
>  
>  
>

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