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The Best of Instructables Volume I by The editors at MAKE magazine and Instructables.com

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3D Magnetic Field Viewer

A super-simple device that shows magnetic lines of force

By Bill Sherman

image

Figure A: A 3D Magnetic Viewer ready to reveal invisible magnetic lines of force

My job takes me to various research labs where I install powerful magnetic systems and train technicians in how to use them. This time, I needed a magnetic field viewer to show lines of force. This Instructable shows how to construct such a device using nothing more than steel wool fibers and mineral oil. I built this one while at my hotel.

1. Get your supplies

I went to Wal-Mart and bought the following items:

Fine steel wool

Bottle of mineral oil in plastic bottle ...

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