Gilley Coil Set.

Use the materials in this complete kit to experiment with magnetic induction in a coil; primary/secondary coils; magnetic lines of force and electromagnetism. Includes: two coils mounted in plastic saddle blocks that stand vertically; five soft iron cores (round, square, double U, and half-round [2]); stiff card and supply of iron filings in reusable vial; four alligator clip leads. You will need 6 V battery or power supply exceeding 1 amp DC; galvanometer.