|If a strong magnet is inserted into a soft rubber globe, then the orientation of the dipole field at the surface of the globe can be investigated by placing staples at various locations.|
I have written a page of information on the Earth's field and another to guide exploration of this model. They are available in html, and pdf formats. I learned of this model from Paul Doherty of the San Francisco Exploratorium.
|Arbor Scientific sells this product as well. You can order one from their site:|