Sunken swarfboard

MACHINE TRANSLATION (not authorised yet)

Disc (20 x 11 cm) with ferro-magnetic filings sunk inside in a special liquid. Since the plate is made of transparent acrylic, help can be presented for demonstration purposes on the overhead projector! For experiments, magnets are required (not included). Very useful teaching aid for experiments with magnetism (nature and physics) in schools, including observation of magnetic field lines.