透明壓克力製成。
尺寸：80×80×80mm。
內裝入液油及鐵粉，可觀察3D磁場及磁力線之變化。
配件：強力磁柱1支。
Demonstrates 3-dimentional shape of magnetic fields.
Constructed of a sealed 80×80×80mm vewing acrylic cube with iron fillings floating in oil. A hole through the center allows a strong alinico cylindrical magnet to be inserted.
The iron filings line up with the field lines of the magnet.
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