Date: Wed, 2 Feb 2005 21:46:28 -0500

Author: "Dick Heckathorn"

Subject: RE: Ring launcher / Thompson coil

Post:

Greetings,

If you pass a bar magnet through a coil with AC current, it will
demagnetize. I have such a coil that has a momentary on switch connected
to it. I found it is the late 50's somewhere.

Dick


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-----Original Message-----
From: owner-tap-l@listproc.appstate.edu
[mailto:owner-tap-l@listproc.appstate.edu] On Behalf Of Gerald Zani
Sent: Wednesday, February 02, 2005 11:57 AM
To: tap-l@listproc.appstate.edu
Subject: Re: Ring launcher / Thompson coil

Sam,

You can deGauss by slowly moving the object away from the AC magnetic
field. JZ

At 10:55 AM 2/2/2005, you wrote:
>If that's so, how can I degauss something with a similar setup?
>
>Sam
>
>Gerald Zani wrote:
>
>>Sam asked:
>>
>>>How do you re-magnetize magnets with AC?
>>
>>
>>I believe that the AC is used to make a B field pulse which is focused

>>onto the material to be magnetized.
>>
>>A momentary pulse of high current AC is used to create a very big B
field
>>pulse for a short period of time. I think it is simply an
electromagnet
>>with a momentary contact switch that is used. A pole concentrator in
the
>>electromagnet is to guide and focus this B field pulse into a small
area
>>where the iron or alnico is placed.
>>
>>You could probably magnetize iron with your Thompson Coil?
>>
>>
>>Am I right? JZ
>>
>>
>>
>>
>>
>>Gerald Zani e-mail: Gerald_Zani@brown.edu
>>Manager of Demonstrations phone: (401) 863-3964
>>Department of Physics FAX: (401) 863-2024
>>Brown University Providence, RI 02912-1843 USA
>>
>>http://128.148.60.98/physics/demopages/demo/
>>http://128.148.60.98/physics/userpages/staff/Gerald_Zani/index.html
>>
>>Do a little more of that work which you have confessed to be good,
>>Which you feel that society and your most Just Judge rightly demand of
you.
>>Cultivate the tree which you have found to bear fruit in your soil.
>>If you have any experiments you would like to try, try them.
>>Now's your chance.
>>
>>Henry David Thoreau, Journal entry, 1850.
>

Gerald Zani e-mail: Gerald_Zani@brown.edu
Manager of Demonstrations phone: (401) 863-3964
Department of Physics FAX: (401) 863-2024
Brown University Providence, RI 02912-1843 USA

http://128.148.60.98/physics/demopages/demo/
http://128.148.60.98/physics/userpages/staff/Gerald_Zani/index.html

Do a little more of that work which you have confessed to be good,
Which you feel that society and your most Just Judge rightly demand of
you.
Cultivate the tree which you have found to bear fruit in your soil.
If you have any experiments you would like to try, try them.
Now's your chance.

Henry David Thoreau, Journal entry, 1850.
From dickheckathorn@sbcglobal.net Wed Feb 2 21:56:18 2005

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