Date: Sun, 28 Sep 2003 23:00:16 -0400

Author: Chuck Britton

Subject: RE: Awesome EM induction demo!

Post:

This magnet assembly is found in every hard drive. The older ones are
bigger of course. A coil of wire on the tail end of the read/write
arm fits in the gap between the magnet faces and provides the driving
force to swing the read/write heads across the disk platters.


NEVER let an old HD get thrown away. Salvage the Magnets!!!


At 10:32 PM -0400 9/28/03, Dick Heckathorn wrote:

>Greetings,
>
>Gene Easter gave me a small apparatus with two very strong magnets
>separated by about 0.5 cm. Said it came from a Cray computer.
>Dropping a silver dollar between takes 2.5 seconds to fall through.
>

--
Chuck Britton Education is what is left when
britton@ncssm.edu you have forgotten everything
North Carolina School of Science & Math you learned in school.
(919) 416-2762 Albert Einstein, 1936
From cbettis@unlserve.unl.edu Mon Sep 29 06:23:59 2003
Message-ID: <00b901c3868a$7f9bed80$96245d81@lecturedemo>
From: "Cliff Bettis"
To:
References:
Subject: Re: Awesome EM induction demo!
Date: Mon, 29 Sep 2003 08:06:29 -0500
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Wolfgang,

Have you tried soldering together a couple of 1 " slabs to make a 2" slab?


Cliff

----- Original Message -----
From: "Wolfgang Rueckner"
To:
Sent: Friday, September 26, 2003 12:22 PM
Subject: Re: Awesome EM induction demo!


> A 2" slab very visibly works better than a 1" slab
> A 1" slab very visibly works better than a 1/2" slab
>
> I've tried 'em all. Wolfgang
>
>
>
> >
> >Everyone: does a 2" slab work better than a 1/2" slab? Or a 1/4" slab?
> >NOT IN THEORY, since we're after visible differences rather than
numerical
> >differences. I.e. what happens when you actually try each one?
> >
> >
> >
> >
> >Alaskan Copper quote for single items up to 6", not including shipping:
> > $30 for a half-inch bar, 6" x 6"
> > $50 for a one-inch bar, 6" x 6"
> > More expensive if wider than "bar" type (if wider than 6")
> > WAY cheaper for larger quantities. $50 min order
> > http://www.alaskancopper.com
> >
> >
> >(((((((((((((((((( ( ( ( ( (O) ) ) ) ) )))))))))))))))))))
> >William J. Beaty SCIENCE HOBBYIST website
> >billb@eskimo.com http://amasci.com
> >EE/programmer/sci-exhibits amateur science, hobby projects, sci fair
> >Seattle, WA 206-789-0775 unusual phenomena, tesla coils, weird sci
From rueckner@fas.harvard.edu Mon Sep 29 06:56:42 2003
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