Hacked Gadgets Forum

May 10, 2007

Magnetic Viewing Paper

at 6:19 am. Filed under Cool Gadgets, Reviews

We can’t see magnetic flux lines but with an inexpensive piece of Magnetic Viewing Paper we can easily visualize what we are missing. I took the motor magnet out of an old 5 1/4 floppy drive and was amazed at the complex magnetic pattern that emerged. It looks like the outer ring of the magnet has magnetic notches that are read by the electronic circuit. I imagine this is used for speed control, although this seems like a very complex method of regulating motor speed. You can also “watch” a relay energize by holding the viewing paper beside a normal relay while energizing the coil. Thanks to Edmund Scientific for providing the cool magnet viewer.

There is a video after the jump of the Magnetic Viewing Paper being swiped across the floppy drive motor magnet.

“Millions of tiny metal particles are suspended in oil within a 20 x 50mm laminated sheet of plastic. When a magnet is placed next to this “viewing paper”, the particles become magnetized.

This paper is so intriguing because it enables you to view the varying magnetic patterns of individual magnets. Take the obscure and begint “viewing” it like it’s magic. Great for educational demonstrations.”