Magnetic Field Demonstrator - Iron Filings Sealed in Fluid. The classic magnetic lines of force demonstration - now in a no-mess plastic case! Simply place a magnet on or near the surface of the demonstrator, and the filings will follow the magnet as you move it. Place a magnet on the surface of the demonstrator, and the filings form the classic lines of force pattern. The filings are suspended in oil, allowing for a smooth flow toward, and around the magnet. Hours of fun and education in a sturdy plastic case! Dimensions millimeters 220 x 120 x 10 or in inches, 8.67 x 4.72 x .39
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