Re: Magnifiers

To: tesla-at-pupman-dot-com
Subject: Re: Magnifiers
From: Richard Hull <hullr-at-whitlock-dot-com>
Date: Mon, 20 May 1996 15:35:04 -0700
Tesla List wrote:
> 
> >From rodney-at-johnxt7.anu.edu.auSat May 18 17:19:14 1996
> Date: Sun, 19 May 1996 01:14:51 +1000 (EST)
> From: Rodney Davies <rodney-at-johnxt7.anu.edu.au>
> To: Tesla List <tesla-at-poodle.pupman-dot-com>
> Subject: Magnifiers
> 
> Hi all,
> 
> Question - what characteristics (w.r.t. the secondary) does the tertiary
> coil need to have? ie, same number of turns, same frequency etc?
> 
> I'm considering using a smaller 10" secondary (700 turns of 0.745mm
> enamel coated Cu wire) as a magnifier, but just curious on some specifics
> I should be following.
> 
> Thanks,
> 
> Rod
> 
> -- "What is the Federal Communications Commission and why do they
>     want my Tesla Coil?"
> 
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> - Tesla Coil Builders of Australia - Canberra                               -
> - Rodney Davies                                                             -
> - Email: Rodney%Johnxt7-at-anu.edu.au                                          -
> - The Australian National University                                        -
> -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Rod,

The Secondary is just a driver for the extra coil.  It should be of 
heavier wire with a lower overall inductance (about 4 times less) 
inductance than the extra coil.  Its frequency, according to Tesla should 
be the same as the extra coil, but we rarely do this and often never 
consider the secondary frequency in any of our magnifier work.  This has 
led us to consider our magnifiers as modified and special cases to the 
two coil system.  Note that regardless, the three coil system is superior 
to a two coil system in the hands of a trained builder.

Richard Hull, TCBOR