|Overall size||x cm ( x in)|
|Artwork||x cm ( x in)|
cm left/right (in)
|Frame face||2cm (0.79in)|
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Product images of A terrella
Product details A terrella
A terrella ('little earth') is a sphere made of a magnetized substance, used to simulate the magnetic field of the earth. In the 16th century the English physician William Gilbert used a terrella made out of lodestone (a naturally-occurring magnetized mineral) to demonstrate that the earth is magnetic, and to explain how mariner's compasses work.
- Image ref: RS-8487
- The Royal Society