Find the direction and dip of Earth's magnetic field lines in your locality. Magnetize a large steel needle or a straight piece of steel wire by stroking it a couple dozen times with a strong magnet. Run the needle or wire through a cork in such a way that, when the cork floats, your thin magnet remains horizontal (parallel to the water's surface). That means first adjust in it so it balances gravitationally. Then float the cork in a plastic or wooden container of water. The needle will point toward the magnetic pole. Then press a pair of unmagnetized common pins into the sides of the cork. Rest the pins on the rims of a pair of drinking glasses so that the needle or wire points toward the magnetic pole. It should dip in line with Earth's magnetic field.