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Re: [TCML] Does Patent 500,630 predate Tesla's coil?

--- On Sat, 5/30/09, Jim Harvey (UDN) <harvey.james@xxxxxxxxxxxxxxx> wrote:

> From: Jim Harvey (UDN) <harvey.james@xxxxxxxxxxxxxxx>
> Subject: [TCML] Does Patent 500,630 predate Tesla's coil?
> To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>
> Date: Saturday, May 30, 2009, 9:51 AM
> Greetings...
> A friend pointed out a patent 500630 that appears to
> predate Tesla on the
> invention of the "Tesla Coil." A link to this patent is
> at:
> http://www.google.com/patents?id=pdZBAAAAEBAJ
> <blocked::http://www.google.com/patents?id=pdZBAAAAEBAJ&dq=500630>
> &dq=500630
> Any thoughts or comments? 
The first record Of Tesla's high frequency coupled oscillatory circuit with an air cored transformer is to be found in patent 454622 of 23 June 1891 under the title "System of electric lighting". The
oscillator converts low frequency currents into "currents of very high frequency and very high potential" which then supplies single terminal lamps. (from Aleksandar Marincic's CSN preface) The arc gap in this schematic is within the tank circuit, something later abandoned as the best method.
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