Early oscillatory circuits

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "D.C. Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com>



Joseph Henry, in 1842, first noticed that induction coils can become
oscillatory in nature when a capacitor (condensor in those days) was added
to the circuit.

In 1847 Helmholtz also noticed the oscillatory nature of the Leyden jar.

Felix Savary, in 1827, actually was the first experimenter to note
oscillatory discharges from capacitors.  Savary did not attach an inductor
and did not discover the LC circuit combination.

Prof. Oliver Lodge, in Liverpool, in 1888, independently discovered the
oscillatory nature of electric current while studying lightning discharges.

Tesla probably beat everyone, but, since he didn't publish much in the
scientific journals of that era, missed early credit for the discovery of
tuned circuits.





----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, October 23, 2002 7:34 PM
Subject: Stone Stone


> Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>
>
> Hi:
>
> I was taking a look at old patents at the U. S Patent Office site:
> http://www.uspto.gov/index.html
> Looking at the earliest patents about spark telegraphy (class 178/116),
> I found the patent RE012151, by John Stone Stone (original 714832,
> from 1902).
> Apart from the curious name, what the patent describes is a Tesla
> coil used as a spark transmitter. The reasoning of the author is
> very clear, specially when he says that the transformer is used to
> produce a higher voltage at the antenna than would be possible by
> the old method of charging the antenna and discharging it through
> a spark gap. He mentions some Tesla patents, that show the same
> structure, but says that Tesla's intention was to transmit the
> signal through conduction in the air, and not through an electromagnetic
> wave.
> I don't know more about Mr. Stone, but recognize that he had
> the right idea about how to use a Tesla coil as transmitter.
>
> In the last days I am spending a lot of time looking at old
> patents. The U. S. site and the European site are free, and contain
> an enormous amount of information. In the European site it's
> possible to search old patents by the name of the author,
> although the results are sometimes confuse. In the U. S. site
> it's possible to see the patents in a given class in reverse time
> order. The U. S. site has the patents in TIFF format. The
> european site (http://ep.espacenet-dot-com) in PDF format.
>
> Antonio Carlos M. de Queiroz
>
>
>
>