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Re: Tesla's Radio Circuit (was tuning more accurately than 5%) (fwd)
---------- Forwarded message ----------
Date: Mon, 27 Jul 1998 06:37:39 +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%) (fwd)
Mike -
Do you believe the Tesla coil was a new idea or was it just a modified
induction coil?
Please - yes or no
john Couture
---------------------------------------------------------
At 10:31 PM 7/25/98 -0600, you wrote:
>
>
>---------- 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
>
>