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RE: [TCML] Multilayered Secondary Coils
Yes, and stunning patience and attention to detail!
Jim Mora
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Chris Swinson
Sent: Thursday, July 24, 2008 2:59 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Multilayered Secondary Coils
That looks really cool Jeff! Can't wait for more :-)
Chris
----- Original Message -----
From: "Jeff Behary" <electrotherapy@xxxxxxxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Thursday, July 24, 2008 10:11 PM
Subject: [TCML] Multilayered Secondary Coils
Hey all,
I've made a few flat coils over the years (some of the first were in
September, 1999), but I think these are my first "real" Pancake Coils.
I've documented the entire creation of one of them:
http://www.electrotherapymuseum.com/2008/29June2008/index.htm
http://www.electrotherapymuseum.com/2008/29June2008/index_2.htm
and have made a second one last night:
http://www.electrotherapymuseum.com/2008/KinraideCoilII/index.htm
They are about the closest thing to what Tesla and others were doing in the
1890s. Many turns of wire, meticulously insulated, embedded in a wax
compound, with a ribbon primary coil. A lot of effort on the part of
several people - Frank, who acquired the impossible - a source for
silk-covered wire, a man who was patient enough to rebuild his machine in
order to cover the cover the wire multiple times. This is normal 30 AWG
magnet wire, covered with silk until it was .040" thick. (Getting the silk
was an ordeal in itself, it took *hundreds* of spools, all had to be
imported). Others may not agree, but I still feel that this wire can be
insulated to a better degree than other wires for this specific
configuration. The coils are wound with a lot of tension, and the
insulation still flows easily between the turns.
I've done some initial tests with both coils individually, and plan to also
test both in series.
With .1 mfd, around 1000 volts, power limited to less than 100 watts, each
coil can produce a 6" spark.
Whether there are many thin sparks surrounded by blue effluves or a single
thick slow crackle depends on the spark gap. The large 6"
diameter gap in the last post makes the former discharge, a 1.25" diameter
tungsten gap opened to point where it nearly doesn't operate produces the
second discharge.
At around 200 watts, I could get a hot flaming discharge 6-8" long. Photos
to come, this time I tried to document the construction of things first.
Jeff Behary
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