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Re: Tesla history project

Original poster: <dgoodfellow@xxxxxxxxxxxxxx>

I don't think I have ever seen a picture of one of Tesla's own coils with a toroid on the top of it. I do remember something like a toroid in a photo from Colorado Springs, but the only really large topload that I have seen (in what books I have) is the Wardenclyffe tower. Could you please indicate where to look for toroids use by Tesla?

Thanks, Dave Goodfellow

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx> To: <tesla@xxxxxxxxxx> Sent: Wednesday, April 13, 2005 7:14 PM Subject: Re: Tesla history project

Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>

The first large coil in the USA was built by George Kauffman in 1903 for the Carnigie Institute (college). It ran at 10 kVA with rotary spark gap and plate glass capacitors. It is still at the Buhl Museum/Planetarium in Pittsburg, PA. Kauffman's father worked in New York digging ditches with N. Tesla when Tesla was going through some hard times.

In 1930 a coil was erected at the Griffith Observatory in Los Angeles.

In the mid-1940's a German group was one of the first (after Tesla) to use a
large toroid atop the secondary coil for electrostatic field control. This
also forces the coil to run efficiently at a single sec freq and not develop
standing wave interference from multiple frequencies.

Dr. Resonance

> > I am doing a project in history on the history of Tesla coiling. I would be > gratefull to anyone who sends me, personally, information on the history if > Tesla coils since 1900 to the present. > Thanks. > Steven > Steele > > >