Quick Answer:The Magnetic Field Line Tube, or 3D magnetic field chamber, is a sealed transparent chamber of iron filings with a central inner tube that takes bar magnets up to 19mm in diameter, showing magnetic field lines in three dimensions without loose filings.
Last updated: 18 October 2026
Key Features
Shows the field around a magnet in three dimensions.
Central inner chamber takes bar magnets up to 0.75 inch (19mm) in diameter.
Fully sealed, so the iron filings cannot escape.
Transparent acrylic/polycarbonate chamber.
Large enough for group viewing and passing round the class.
Technical Specifications
Specification
Value
Chamber
Transparent acrylic/polycarbonate
Contents
Iron filings, in a viscous fluid or a sealed dry chamber
Magnet bore
Takes bar magnets up to 0.75" (19mm) diameter
Construction
Fully sealed
How It Is Used
A bar magnet is slid into the central chamber and the iron filings around it line up along the lines of force, showing the field pattern all round the magnet rather than on a flat sheet. Because the filings are sealed in, the tube can be handed round the class without mess.
Frequently Asked Questions
What size magnet fits the Magnetic Field Line Tube?
The central inner chamber takes bar magnets up to 0.75 inch (19mm) in diameter.
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