My job takes me to various research labs to install powerful magnetic systems and to train techs how to use them. This time I needed a magnetic field viewer to show lines of force. This instructable will show how to construct such a device using steel wool fibers and mineral oil. I built this while I was staying at my hotel.
Step 1: Get your supplies
I went to Walmart and got the following items and brought them back to my Hotel.
1. Fine steel wool.
2. Bottle of Mineral Oil in plastic bottle.