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.
Step 2: Cut the Steel Wool
Use the scissors to cut the steel wool into small short pieces. About a tablespoon of cut steel wool should be enough. Spread out sheets of newspaper on your work surface and try not to get clippings all over the place.
Step 3: Place in Bottle of Oil.
Place the cut steel wool in the bottle of mineral oil. Clean the top of the bottle with a paper towel so you will get a good seal. Squeeze the sides of the bottle as you put on the cap to burp out the air. Shake to disperse the fibers.
Important note: Clean up any mess, and dispose excess fibers in your trash immediately. Place it in a plastic bag so it doesn't spread all over. The longer your mess sits around, the more likely you will spread it.
Step 4: Test the Viewer
Place a magnet against the bottle. The viewer will show the lines of force.