This equipment hung from the ceiling records magnetism and the gravity of the earth. Movement a compass shakes and shows a direction, and movement of balance inclines by a liquid falls like intravenous drip. Equipment
magnetic field record describes by applying these two movements. The dropper containing Chinese ink, and the weight supporting the spindle. The Chinese ink falls, and the dropper becomes light and inclines, then it moves to a center gradually, the horizontally extended magnet is pulled to the magnetism of the earth, and repeats inversion motion.