(C) Invent an experiment to show that magnetism will act through your hand.
(D) Invent an experiment to show that magnetism will act through water.
18. Magnetic Transparency; Magnetic Screens. Substances, like paper, are said to be transparent to magnetism. Iron does not allow magnetism to pass through it as readily as paper and glass; in fact, thick iron may act as a magnetic screen.
EXPERIMENT 8. To find whether a magnet can give magnetism to a piece of steel.
19. Note. You have seen that the horseshoe magnet can lift nails, iron filings, etc.; you have used this lifting power to show that the magnet was really a magnet, and not merely an ordinary piece of iron painted red. Can we give some of its magnetism to another piece of steel? Can we pass the magnetism along from one piece of steel to another?
Apparatus. The horseshoe magnet, H M; two sewing-needles that have never been near a magnet; iron filings.
20. Directions. (A) Test the needles for magnetism with the iron filings, and be sure that they are not magnetized.
(B) Remove the armature, A, from H M, then touch the point of one of the needles to one pole of H M.
(C) Lay H M aside, and test the point of the needle for magnetism.