Magnetic Field Lines Visualization with Iron Filings and U-Magnet #3572260 (License: Personal Use)

This vintage illustration depicts a classic electromagnetic demonstration: a sheet of paper or card placed over a U-shaped (horseshoe) magnet, with iron filings sprinkled on top to visualize the magnetic field. The filings arrange themselves into distinct curved lines emanating from the north pole, looping through space, and converging at the south pole-highlighting field direction and relative strength. The two rectangular cutouts likely represent magnet poles or supports for positioning.

Used in physics classrooms, museum exhibits, and educational websites to teach magnetism fundamentals; matches user intent for learning how magnetic fields are visualized experimentally.