terrella การใช้

One large terrella experiment was reconstructed in Troms? Norway.
In this work, he describes many of his experiments with his model Earth called the terrella.
The terrella also helped with other geomagnetism experiments, like showing that compass orientation varied near land masses and mountains.
Brunberg and Dattner in Sweden, around 1950, used a terrella to simulate trajectories of particles in the Earth's field.
Birkeland's terrella experiment, which consisted of a small, magnetized sphere representing the Earth suspended in an magnetic poles of the terrella, simulating the aurora.