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Tesla ? coil - Griffith Observatory
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From: Bill Noble [SMTP:william_b_noble-at-email.msn-dot-com]
Sent: Thursday, June 04, 1998 11:45 PM
To: Tesla List
Subject: Re: Tesla ? coil - Griffith Observatory
the coil at the Griffith Observatory (in griffith park, in the Hollywood
hills) is half of an older coil - it is run daily for visitors. There is a
data sheet available on the coil - perhaps the observatory has a web site??
I haven't checked for that. The original coil had two tapered secondaries
and the primary in the middle, if I remember the brochure correctly.
And,yes, the coil is still there.
-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: 'Tesla List' <tesla-at-pupman-dot-com>
Date: Wednesday, June 03, 1998 9:54 PM
Subject: Tesla ? coil
>
>----------
>From: Terry Perdue [SMTP:terryp-at-halcyon-dot-com]
>Sent: Wednesday, June 03, 1998 7:31 PM
>To: Tesla List
>Subject: Re: Tesla ? coil
>
>Raymond Koonce wrote:
>
>> Some time ago I visited the Science Place museum at Dallas Fair Park and
>> witnessed the "Electric Show". There was a demonstration of a large
VanDe
>> Graf generator (very impressive) and a coil quite unlike a conventional
>> Tesla coil. It was a orizontally- mounted ~3 ft. diameter coil which
>> tapered to a ~4" disk from which the discharge (6-8 feet long) emanated.
>> The controller apparently had a rotary gap (completely enclosed). The
>> only connection from the controller to the coil was by two thick cables.
>> Does anyone have an idea what type of coil this is?
>
>I've only been subscribed to this list a short time, but this is the first
>reference I've seen describing a tapered secondary. It reminded me of the
TC
>I saw as a kid at Griffith Observatory, outside LA, I believe. I recall it
>as having a flat spiral primary of flat copper strap, and a tapered
>secondary with a round terminal with spikes on opposite sides. It
discharged
>to the walls of the room, a few feet away. Does anyone know if there's an
>advantage to tapering the secondary this way?
>
>Terry
>terryp-at-halcyon-dot-com
>
>
>