Re: Magnetic Field in a Flat Spiral

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

Original poster: "rheidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

Blue steel banding burned and laquered to gether makes fine core material.
  Robert  H 

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Sat, 09 Mar 2002 10:56:18 -0700
> To: tesla-at-pupman-dot-com
> Subject: RE: Magnetic Field in a Flat Spiral
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Sat, 9 Mar 2002 11:04:24 -0700
> 
> Original poster: "David Thomson by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <dave-at-volantis-dot-org>
> 
> Hi Ed,
> 
>> Just looked at your picture.  Where'd you get those neat binding posts?
> Look like something out of the distant past, but really useful.
> 
> They came out of old military low voltage test sets.  Yes, they are very
> useful.
> 
>> You haven't describee the rest of your system or the before and after
> magnetic field gap performance; please do.
> 
> It's pretty subjective.  Before using the magnets the spark gap worked, but
> after using the magnets the spark gap sounded about 3 times louder.  The
> spark output increased noticeably, but I didn't measure it.  I just wanted
> something that worked well.
> 
>> By the way, I think the magnetic field in the gap would be stronger if you
> used a closed magnetic circuit (C-shaped iron or steel rod or bunch of
> sheets, with magnets along one leg and the gap between the open ends of the
> C.
> 
> I fully agree.  I've got my eyes open for such triangular pieces of soft
> iron.  When I find it, I'll apply it to the gap.  I'm just fortunate that
> the magnets are super strong as they are.  I'll bet the efficiency will
> double when I get the iron to close the magnetic circuit.  It's conceivable
> that too much magnetic force will prevent the spark gap from firing.
> 
> The magnets I'm using on this gap are 1 1/2" in diameter.  They are so
> strong that I nearly broke the bones in my fingers when I accidentally
> brought them about 8" from each other.  It took about 2 minutes before I
> could find something to pry them off of my fingers.  And then as they
> slipped past my fingers they pinched the skin pretty bad.  The only way I
> can get these separated is to put them in a vise and slide them as far as I
> can and then apply all my strength to pry them apart.  I now apply as much
> caution to working with NIB magnets as I do to working with a 15KV
> transformer.
> 
> Dave
> 
> 
> 
>