RE: was RE: First coil built

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Day, Michael" <Michael.Day-at-USPTO.GOV> 

I've seen pictures of some of Hull's awesome coils.  11X spark length from
a coil that has a 1X winding length is truly a remarkable and inspiring
result.  It illustrates the importance in controlling the shape of the
electric field.

Does anyone know what the coefficient of coupling was between the primary
tank and the secondary in Hull's magnifier, and what kind of driver was
he using?

I understand he did a lot of work with thyratron/ignitron drivers.  Are
they worth the trouble?

Mike Day

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Friday, September 24, 2004 8:51 PM
To: tesla-at-pupman-dot-com
Subject: Re: was RE: First coil built


Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>


The EM fields help to "steer" the discharge away from the sec coil.  2X
isn't anything to brag about.  Rich Hull obtain a 11X in one of his
"magnifier" type of coils.  Very powerful indeed.

Dr. Resonance

  >
  > I will have to agree.  I have a BSEE and an MS in Physics, and I too
  > find Tesla coils fascinating, esp. the math and physics.  Kudos to
  > Antonio Carlos M. de Queiroz for the solid foundation.  Still it is
  > the beauty of a brush discharge, and the amazing fact that people
  > like D.C. Cox can obtain 18 ft. sparks from a 9 ft. coil that holds
  > me spell bound.  How can this be, and why doesn't the coil always
  > short to the base or primary?  I learned long ago that RF is FM
  > (Friggin' Magic), and the importance of a good ground connection.
  >
  > EM rocks.  Rock on.
  >
  > Mike Day