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Q: magnetics ( Answered,   0 Comments )
Subject: magnetics
Category: Science > Technology
Asked by: butchme-ga
List Price: $5.00
Posted: 24 Nov 2006 07:44 PST
Expires: 24 Dec 2006 07:44 PST
Question ID: 785240
How do the magnetic doodle boards work?  The ones with the stylus that
has the magnetic tip and a slide bar the erases what has been done. 
How can some be blue and others are black?  Different type of magnets?
Subject: Re: magnetics
Answered By: tlspiegel-ga on 24 Nov 2006 09:20 PST
Hi butchme,

Thank you for your interesting question.  

How Stuff Works - How Magna Doodle Works by Craig C. Freudenrich, Ph.D.

You'll see a Table of Contents with a menu.  You can click on any of
the titles and be taken to that page, or else click on NEXT PAGE at
the bottom of each page.  Pages include:  Introduction to How a Magna
Doodle Works, Inside a Magna Doodle, The Heart of It All, Magnetic
Pen, Magnetic Eraser, The Case, In Action.

On this page:  The Heart of It All explains the colors...

*  The magnetic particles are dark, small and fine (about 10 microns)
- This allows them to be seen easily, to stack up and to be nearly
unaffected by gravity.
   - magnetic oxides - black magnetite, gamma-hematite, chromium oxide, ferrite 
   - magnetic alloys - iron, cobalt, nickel 

*  Dye is mixed in - This provides high contrast to the dark magnetic particles. 
   - white pigment - most effective (concentrations of 3 to 10
percent) and most commonly used
   - colored pigments - in some Magna Doodles 


You might also be interested in the Etch A Sketch.


Keyword search:

how do magnetic doodle boards work
Magna Doodle How Stuff Works
colored magnets


Best regards,
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