Terrella

A terrella (Latin of `little earth`) is a small magnetised model ball representing the Earth, that is thought to have been invented by the English physician William Gilbert while investigating magnetism, and further developed 300 years later by the Norwegian scientist and explorer Kristian Birkeland, while investigating the aurora. Terrellas had.....
Found on http://en.wikipedia.org/wiki/Terrella

terrella

magnetic model of the earth
Found on http://phrontistery.info/t.html

terrella

terrella A magnetic model of the earth.
Found on http://www.wordinfo.info/words/index/info/view_unit/2120/4
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