Re: Tesla's Radio Circuit (was tuning more accurately than 5%) (fwd)

To: tesla-at-pupman-dot-com
Subject: Re: Tesla's Radio Circuit (was tuning more accurately than 5%) (fwd)
From: Tesla List <mod1-at-pupman-dot-com>
Date: Sat, 25 Jul 1998 22:31:21 -0600 (MDT)
Approved: mod1-at-pupman-dot-com



---------- Forwarded message ----------
Date: Fri, 24 Jul 1998 20:38:27 -0700 (PDT)
From: Michael Nolley <mhnolley-at-willamette.edu>
To: Tesla List <tesla-at-pupman-dot-com>
Cc: tesla-at-pupman-dot-com
Subject: Re: Tesla's Radio Circuit (was tuning more accurately than 5%) (fwd)



On Thu, 23 Jul 1998, Tesla List wrote:

> 
> 
> ---------- Forwarded message ----------
> Date: Thu, 23 Jul 1998 05:13:18 +0000
> From: "John H. Couture" <couturejh-at-worldnet.att-dot-net>
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: Re: Tesla's Radio Circuit (was tuning more accurately than 5%)
> 
> 
>   Richard, All -
> 
>   I disagree about Tesla having "honed what was first just a glorified
> induction coil system". The induction coil and the Tesla coil are two
> completely different electrical concepts.
> 
>   The induction coil stores electricity in a coil and produces a high
> voltage (inductive kick) when the circuit is OPENED. The Tesla coil stores
> electricity in a capacitor and produces a high voltage (in the secondary)
> when the circuit is CLOSED. There is much more.
> 
>   However, this is not the important radio aspect of the Tesla coil that
> Marconi stole from Tesla. Up until the time of Tesla's "Tesla coil"
> invention it was impossible to transmit more than microwatts using Hertz's
> circuits and radio waves. Tesla's invention was a dual RCL circuit that made
> it possible to go from microwatts to megawatts in radio transmitters. This
> is the concept that Marconi stole from Tesla. The US patent department was
> conned by Marconi into believing Marconi's circuit was a different concept.
> Even today the radio concept of Tesla's invention is not well known or
> understood.
> 
>     John Couture
> 
> -----------------------------------------------------
	His comment, though, rings true, John-- Although I haven't much 
in the way of data about Tesla's early coils-- I DO have his London 
lecture from 1899 (see earlier post)  "Experiments at high potentials and 
high frequencies"  Indeed, the coil here isn't designed for resonance-- 
it has an iron core, over 100 primary turns, the connection with the TC 
is that it is charged by a "disruptively discharged capacitor".  Already 
Tesla had designed muliple gaps, air quenched, magnetic, etc. to improve 
the performance of the coil-- but the standard form hadn't yet emerged.  
The Tesla coil doesn't seem to have been "envisioned" but discovered 
gradually.  I don't contest the radio stuff-- but I think the induction 
coil and the Tesla coil are closely related in geneology.
		--MIke