Displaying core states

From: Mike Ford <mikeford_at_netwiz.net>
Date: Thu Apr 22 18:13:53 1999

>At 11:32 AM 4/22/99 -0700, Chuck McManis wrote:
>>Somewhere in my boxes of stuff I've got one of the tape "visualizer" cards.
>>Its looks like a translucent grey plastic card and when you hold it over a
>>magnetized surface it shows the magnetic "spots" by turning white (what it
>
>There's also the $9-$20 "Magnadoodle" technology available in the toy
>section of almost any store that flips from white to black after
>having been exposed to a magnetic pole. I thought you had kids. :-)

I have a spray can of stuff that is used to make analytical measurements on
magnetic media. Spray it on, and you can see the tracks and transistions
with a microscope.
Received on Thu Apr 22 1999 - 18:13:53 BST