Re: [TCML] Kinraide Coil Reproduction - Near Completion. Near exhausted.

["DC Cox" <resonance@xxxxxxxxxxxx>]

Beautiful work Jeff  --- no wonder you are exhausted.

The bakelite insulators are a nice touch.  Did you find some antique ones or
machine them?

Hope you might be able to haul it up to our Tesla Fest on Sept. 6th.

Dr. Resonance




On Wed, Aug 20, 2008 at 10:05 PM, Jeff Behary <electrotherapy@xxxxxxxxxxx>wrote:

>
> Hey All,
>
> The Beeswax/Rosin/Silk/Cotton/Copper/Bondo/Brass/Bakelite/Brazilian Cherry
> experiments are coming to a close, finally.  Just the polishing bits left,
> staining, lacquering, and hard rubber posts to add for X-Ray tube
> connections, and insulating handles.
>
> Coils, with revolving/sliding discharging posts mounted:
> http://www.electrotherapymuseum.com/2008/20August08/index.htm
>
> Testing spark capacity at various currents.  12" Sparks between ball
> terminals.
>
> http://www.electrotherapymuseum.com/2008/KinraideCoilNearingCompletion/index.htm
>
> Crude YouTube of testing using a variac.  Note the sound differences in the
> sparks as the voltage rises...
> http://www.youtube.com/watch?v=k3bWPyJaZdA
>
> Some original ads for Kinraide machines:
> http://www.electrotherapymuseum.com/2008/KinraideAds/KinraideAds.htm
>
> The spark gap will have some additional posts for external spark
> gaps/interrupters of other kinds.  These will produce much different spark
> variations (pseudo-static, etc...).
>
> Current spark gap is here:
> http://www.electrotherapymuseum.com/2008/ElectricalSparkGap/index.htm
> This produces long, thin sparks with a lot of effluve innerspaced.
>
> Much different than a simple 1/4" OD Tungsten Gap, with the same coils:
> http://www.electrotherapymuseum.com/2008/BipolarFire/TBKCrackle.wmv
>
> Specs:
>
> Base is 18" x 24" x .1875" bakelite mounted to 1" x 4" Brazilian Cherry
> [floor panels]
>
> (2) 1000 turn Pancake Coils insulated in beeswax/rosin, 6 turns of 1" wide
> copper ribbon for each primary, secondary coils contained in a Bondo/resin
> housing.
>
> Top load for each coil is a 1 7/8" diameter ball with a 10" sliding rod
> 5/16" OD with a 3/4" brass ball on the end.  The centre discharge ball has a
> 7/16" OD x 5/8" long plug that fits tightly into a .45 calibre brass
> cartridge shell mounted to the top of each coil as a socket receptacle.
>  (Other cartridge shells can be found machined into spark gap
> standoffs...I'm too broke to order bar stock!)
>
> Spark gap - 6" OD 6061-T6 aluminum spark faces, earliest style of
> "quenched" gap using copper water jug to remove heat rapidly from
> electrodes.  It does actually work after a bit of tinkering to get the faces
> plane and parallel to each other.
>
> Transformer - 7.5" x 3.5" x 1" core.  500 turns #22 cotton covered wire for
> the primary, 8000 turns of #32 enameled wire for the secondary, wound in 20
> layers.  1760 volts.
>
> Reactance coil, 5 tapped points+common.  Core 7/8" square x 5.25" long.
> Wound with 22 AWG DCC wire.   165 turns of wire in one layer, tap 1; 165
> turns in second layer, tap 2; 2 more layers tap 3; 2 more layers, tap 4; two
> more layers, tap 5; 1 more layer, final lead #6.
>
> Still determining the maximum current of this one.  It is believed to be 2
> or 3 amps at the most.
>
> Condenser, 4kV .11 mfd (2 -  2kV .22 mfd in series)
>
> Knife Switch for on/off
>
> 10 amp external variac, to control voltage.  On the lowest power setting,
> unit will function easily with as little as 50 volts from the variac, 800
> volts from the transformer.  Unit has been tested with as little as 30 volts
> (480V from the transformer) with a lot of spark gap tinkering...
>
> Definately not your average coil, but the one the earliest physcians made
> their first X-Rays with.  Rita informs me it can't stay on the coffee table
> forever, so I'll have to move it to the museum...the weight, like the
> originals, is around 50 - 60 pounds.  Each Pancake Coil, without the
> discharger ball/post, weighs a little over 10 pounds a piece!
>
> Jeff Behary
>
>
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