Terrella

sl:terela

float

The terrella, or little earth, was an invention of William Gilbert in the 16th century. Ground from a lodestone, it simulated the magnetic dip of the Earth.

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Birkeland-terrella.jpg
Kristian Birkeland and his magnetized terrella experiment

Kristian Birkeland used a magnetised terrella to model the Earth's polar aurora.

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