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'[TECH] Magnetic field viewing film - bistable, hig'
2008\08\05@144715 by M. Adam Davis

face picon face
I thought a lot of you would get a kick out of this:

http://oersted.com/magnetic_viewing_film.shtml

Magnetic field viewing film - green plastic turns black where a field
penetrates the sheet.  High resolution, bi-stable - you reset it by
swiping a magnet across the surface.

Relatively inexpensive - 1 square foot is $40.  A 3"x3" patch is
$4.50.  I could see using this as poor man's e-paper - perhaps making
a high resolution line solenoid array, drawing the 'paper' through,
and using it until it needs new information.  Different from the
magna-doodle ( http://www.howstuffworks.com/magna-doodle.htm ) but
similar in several interesting ways.

-Adam

--
EARTH DAY 2008
Tuesday April 22
Save Money * Save Oil * Save Lives * Save the Planet
http://www.driveslowly.org

2008\08\05@150732 by piclist

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face
On Tue, 5 Aug 2008, M. Adam Davis wrote:
> I thought a lot of you would get a kick out of this:
>
> http://oersted.com/magnetic_viewing_film.shtml
>
> Relatively inexpensive - 1 square foot is $40.  A 3"x3" patch is
> $4.50.  I could see using this as poor man's e-paper - perhaps making
> a high resolution line solenoid array, drawing the 'paper' through,
> and using it until it needs new information.

It would be tricky.  The stuff only really tracks changes between a field
pointed at the paper, and a field paralell to it.  YOu can see this in a
photo from my site...

http://www.ian.org/Magnetics/SeventyTwo14INSqB.jpg

The magnets are set up in an alternating north-south pattern, but you can
see that the squares all look the same as the paper does not show the
difference between north and south magnetic fields.

I think the biggest difficulty would be generating an intense, but very
localized field, or else you erase the pattern you had drawn as you move
down to draw the next line.

But it's cool stuff!

--
Ian Smith
http://www.ian.org

2008\08\05@210540 by Cedric Chang

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face
> http://oersted.com/magnetic_viewing_film.shtml
>
> Relatively inexpensive - 1 square foot is $40.  A 3"x3" patch is
> $4.50.  I could see using this as poor man's e-paper - perhaps making
> a high resolution line solenoid array, drawing the 'paper' through,
> and using it until it needs new information.


Once you have "written" to this film, how long does the image last ?
How sensitive is it to temperature ?  1)  as far as retaining the  
image   2) as far as writing the image ?
How much light does the film pass through it ?  Could you project an  
image with an overhead projector ?

cc

2008\08\06@042302 by Alan B. Pearce

face picon face
>It would be tricky.  The stuff only really tracks changes between a
>field pointed at the paper, and a field paralell to it.  YOu can see
>this in a photo from my site...

Can one still get spray on mag tape developer? I remember we used to get it
from Burroughs, but I think they were marketing someone elses product under
their own name. That was great stuff to use for looking at magnetic fields.

2008\08\06@095636 by M. Adam Davis

face picon face
On 8/6/08, Alan B. Pearce <spam_OUTA.B.PearceTakeThisOuTspamrl.ac.uk> wrote:
> >It would be tricky.  The stuff only really tracks changes between a
> >field pointed at the paper, and a field paralell to it.  YOu can see
> >this in a photo from my site...
>
> Can one still get spray on mag tape developer? I remember we used to get it
> from Burroughs, but I think they were marketing someone elses product under
> their own name. That was great stuff to use for looking at magnetic fields.

Wow, I didn't even know this stuff existed!

http://www.q-card.com/pdf/Developer%20sales%20sheet%20rev2.pdf

Yes, you still can.

-Adam

--
EARTH DAY 2008
Tuesday April 22
Save Money * Save Oil * Save Lives * Save the Planet
http://www.driveslowly.org

2008\08\06@104608 by Alan B. Pearce

face picon face
>Wow, I didn't even know this stuff existed!
>
> http://www.q-card.com/pdf/Developer%20sales%20sheet%20rev2.pdf
>
>Yes, you still can.

Great. Yes it is great fun to use. I did have reason to use it in serious
manner on a couple of occasions, and recommend its use on another couple.

Great for looking at sectoring on disks or (as illustrated on above link)
channels on tape.

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