Re: Twin coil idea / Tesla's Lectures w/ coil specs: Feb 1892

To: tesla-at-pupman-dot-com
Subject: Re: Twin coil idea / Tesla's Lectures w/ coil specs: Feb 1892
From: "Malcolm Watts" <malcolm.watts-at-wnp.ac.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Thu, 16 Sep 1999 19:19:26 -0600
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi Jeff,

> Original Poster: "Jeff Behary" <jeff_behary-at-hotmail-dot-com> 
> 
> Malcom and others,
> 
> Please note in Tesla's lecture in London Feb 1892 "High Frequency and
> High Potential Currents", (page 217 "Inventions, Researches, and
> Writings of Nikola Tesla" Barnes & Noble)
> 
> He mentions a small twin coil to produce extremely powerful fine-grain
> effluve without large sparks, to be demonstrated by one small and one
> large ring of wire in the same plane with ionisation inbetween. Wound
> on thick Bohemian glass tube,  5cm diameter x 20 cm long.  Secondary
> is 24 AWG. Primary is 12 AWG, and fits INSIDE of the secondary. Two of
> these coils are used, with secondaries in series and primaries in
> multiple arc.  Condensers in series, spark gap in parallel.  Tubes
> placed in oil insulation 10-15cm apart. Coil excited from 2 four-pint
> jars in series.

I built what was supposed to be a replica of one of his early lumped 
disruptive coils a couple of years ago and saw the effects you 
mention. I can also get the same effects using a normal coil. 
Spreading the discharge area out appears to be the sole 
mechanism for generating these type of discharges. 

Regards,
Malcolm
 
> Tesla's lectures usually dwelled on various induction-type coils, and
> "Rochefort type resonators" coils where there are two series primaries
> and two multi-layer secondaries of small widths and large diameters. 
> Has anyone built these types of coils??
> 
> The metal rings in this lecture were 80cm and 30cm.  This same coil is
> said to have made a "strong luminous sheets" occupying a square meter.
> 
> I have built somewhat-similar single primary-secondary Violet Ray type
> disruptive discharge coils, multi-layered, many layers (~20) of
> relatively few turns (.25-5") but heavily insulated on either end to
> prevent sparkovers. (3" wide paper). I replaced the parallel-wire
> primaries of the originals with a 1/2" brass strap flat spiral, wound
> like tape on itself (insulated by paper) and get better results than
> the former method adopted by most manufacturers, taking up slightly
> more space.
> 
> Also twin coils Fig 132 page 207.  Clear drawings, and very
> interesting, with a ratio of primary:secondary 1:5.4 or 1:2.7
> depending on whether primaries are series/parallel.
> 
> These coils would be intensely interesting to build, has anyone on the
> list attempted them??
> 
> I don't hear too much about these lectures on the list, and they
> mention many of our recent conversations on x-rays/ vacuum discharges/
> funny streamers and sparks /etc.
> 
> Jeff
> 
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