Re: [TCML] Tesla coil history - which came first?

[Dan Kline <misterpaslow@xxxxxxxxx>]

I used to have a reprint of Thompson's lecture where he demonstrated his high-frequency coil, but I lost it somewhere.

The coil itself was three feet long, and had a trifilar-wound primary that was the same length as the secondary.
The entire thing was immersed in oil, and the wires from the secondary were taken out on each end through oil-filled troughs 
that were five inches square. The discharge was 60 inches between the terminals.

Thompson, going by the convention of induction coils being rated in terms of spark-length, stated that with his coil, (a 60" discharge), coils such as the Spottiswoode
coil (1887 - 2-point-something miles of wire in the secondary for a 60 inch discharge induction coil) were rendered obsolete.

He also calls Tesla 'an early worker in the field' in this lecture.



----- Original Message -----
> From: Frank <fxrays@xxxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Cc: 
> Sent: Monday, September 19, 2011 3:35 PM
> Subject: RE: [TCML] Tesla coil history - which came first?
> 
> Elihu Thompson had the first high frequency coil in the generally 
> accepted form about a year before Tesla. He commented in a letter he 
> would not fight Tesla for the credit.
> 
> At 11:43 AM 19-09-11 -0700, you wrote:
>> I believe it was Heinrich Hertz that realized early on that when a
>> capacitive charge was discharged through a coil/spark gap that a
>> separate additional coil/spark gap of the same length, in close
>> proximity, would create a sympathetic discharge. He published his
>> findings in 1888. This would most likely be the earliest example of
>> wireless transmission of energy, and thus, the air resonant coil.
>> 
>> Shannon Weinhold
>> Klasdja Intelligent Innovations
>> 
>> -----Original Message-----
>> From: Jim Lux [mailto:jimlux@xxxxxxxxxxxxx]
>> Sent: Monday, September 19, 2011 6:56 AM
>> To: tesla@xxxxxxxxxx
>> Subject: Re: [TCML] Tesla coil history - which came first?
>> 
>> On 9/19/11 5:52 AM, Antonio Carlos M. de Queiroz wrote:
>> 
>>  > Experimentally, it's quite evident that the roots of the classical
>>  > Tesla coil lie in the development of the induction coil, that has
>>  > practically the same structure, but works in a (not so) different way.
>>  >
>> 
>> I wonder when someone realized that you didn't need the iron core of the
>> induction coil and that the resonance aspect was important..
>> 
>> 
>> 
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