Re: Displacement Current Revisited

  Ross -

  I agree that the 150 Khz wave would not affect the compass if it was a
symmetrical sine wave. But what if, as Tesla mentioned, the wave was not

  The RF induction heating around an operating TC apparently affects any
metal in the vicinity of the coil. Do you believe this current is what
energizes an incandescent lamp with a wire antenna held near the coil? How
would you consider this a closed circuit? 

  John Couture


At 10:46 PM 3/21/99 -0700, you wrote:
>Original Poster: "Ross W. Overstreet" <ross-o-at-mindspring-dot-com> 
>How could the slow dynamics of a compass react to a magnetic (inductive) field
>changing at 150 Khz?
>I have seen the effects of the inductive field 1st hand.  I used a 7" hose
>to attach my ground strap to the base of my secondary.  It got so hot that it
>melted half way through my 6" SDR pipe!  I'm assuming that it got hot from
>heating where the (I) was induced.  It was also interesting to note that it
>the hottest where the cross sectional area was the smallest - near the
>Current density and resistance were higher here.
>> ----- big snip ---
>>   Coilers are apparently not familiar with the induction field around the
>> Tesla coil. If I understand this field correctly a coiler should be able to
>> detect the field with a compass placed near a TC while it is energized. The
>> compass is not sensitive to the EM field but should deflect because of the
>> magnetic effect of the induction field. The compass would have to be
>> properly aligned and very close to the center of the secondary winding. Has
>> anyone tried this test? Reinhart's lamp could be used but this is also
>> sensitive to the EM field.
>>   John Couture
>> ----
>Ross Overstreet
>ICQ# 20762411