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This  apparatus makes apparent the field lines of a magnetic field using multiple compasses in 3d.  The user can pick up a magnet, orientate it and move it to wherever he/she wants.  All the while the compasses indicate the field lines.

The magnet can be placed in the middle of the apparatus to illustrate the classic symmetry of a bar magnet’s field.  This is a very dramatic and realistic experiment.

Magnetic field line demonstrator