MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Magnetic probe showing field direction. This is a Magnaprobe, and consists of a small bar magnet suspended in a gimbal mounting. The mounting allows the magnet to swivel and align with the direction of another magnetic field, in this case the one produced by the larger bar magnet seen in the background (upper left).
Model release not required. Property release not required.