[BC] Re: KSDK

[Al Wolfe]

> Date: Tue, 31 Jan 2006 09:14:50 EST
> From: WFIFeng at aol.com
> Subject: Re: [BC] KSDK
> To: broadcast at radiolists.net
> Message-ID: <29d.4942ca7.3110cada at aol.com>
> Content-Type: text/plain; charset="US-ASCII"
>
> In a message dated 01/31/2006 08:59:15 AM Eastern Standard Time,
> DHultsman5 at aol.com writes:
>
>> And I thought all those masts were made of lightweight aluminum, a non
>>  ferrous metal???????
>
> Even aluminum will react to a powerful enough, fluctuating magnetic field.
> With a powerful magnet, you can feel this effect- get a magnet from a 
> defunct
> hard drive, and slide it quickly over an aluminum plate. You will feel a 
> very
> distinct resistance which increases as you move the magnet faster. You can 
> also
> feel it if you have a bulk tape eraser. Bring that aluminum plate close to 
> the
> field, and you will feel the magnetically induced vibration in it.
>
> Willie...

    When I was in college we had an electrical cannon in the EE dept. that 
fired eight inch aluminum rings about fifty feet. Basically, it just 
discharged a capacitor bank through a coil, the aluminum ring being in close 
proximity to the coil. I guess the eddy current in the ring built up enough 
of a magnetic field to repulse the field in the coil and send it flying.

    (Dave Hershberger, remember this from EOH?)

Al Wolfe, retired mostly,
aka K9SI