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

[Jeff Behary <electrotherapy@xxxxxxxxxxx>]

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
 
 
_________________________________________________________________
See what people are saying about Windows Live.  Check out featured posts.
http://www.windowslive.com/connect?ocid=TXT_TAGLM_WL_connect2_082008_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla