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Re: Coil at Frys
The conical coil at Griffith Park is half of a dual coil bipolar design. The
other coil was stored in the gardeners shed for years. When they went down
some years ago to get it it was found to be missing.
No one knows where it got off to. It was never seen again.
>Hummm, sure sounds like it may be the other half of the TC at the Griffith
>Observatory in Los Angeles!? I understand originally it was a bipolar
>design.
>
>--Steve
>
>----------
>> From: Tesla List <tesla-at-pupman-dot-com>
>> To: tesla-at-pupman-dot-com
>> Subject: Coil at Frys
>> Date: Tuesday, May 11, 1999 8:54 AM
>>
>> Original Poster: "LWRobertson" <LWRobertson-at-email.msn-dot-com>
>>
>> Hi ...
>>
>> For those in the SF Bay area there is a very nicely built
>> coil at Frys Electronics new store at 680 and Automall
>> Pky ( formerly Durham Rd. ) in Fremont. Entrance off of
>> Osgoode. If you talk to a salesman they'll get someone
>> to turn it on for you.
>>
>> I guess it was built to emphasize historical accuracy over
>> raw performance .
>>
>> The secondary is conical, about 3 feet in diameter at the
>> bottom, and a foot or so at the top, wound with around
>> 300 turns of quite heavy space wound wire. A foot above
>> the top is a copper sphere also about a foot in diameter
>> with two discharge points arranged diametrically opposite
>> each other.
>>
>> Primary is 2 inch or so copper strip, nicely polished, as is
>> the capacitor - gap - coil connections. Seems to be tapped
>> around turn four.
>>
>> The gap is a really pretty rotary driven by a cogged belt
>> from a motor hidden underneath.
>>
>> It's in a Faraday cage made from heavy chain link and built
>> into a gazebo.
>>
>> Makes fairly strong connected arcs to the chain link probably
>> 4 feet away, easily visible in the well lit store. The inside of
>> the gazebo is black, which helps.
>>
>> When a keyswitch is turned it starts up a little while later
>> for a few seconds (10 or 15 or so).The guy who had the
>> key didn't know who made it, but the workmanship is superb.
>> Someone put a lot of time on this one.
>>
>> LR
>>
>>
>>
>>