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University of Wisconsin physicist Cary Forest with a prototype of the Madison Dynamo Experiment.
University of Wisconsin physicist Cary Forest with a prototype of the Madison Dynamo Experiment. In the full experiment, the one-meter wide, stainless steel shell is filled with molten sodium metal. (The prototype used water.) The metal, in turn, is stirred by two motor-driven, opposing propellers so that its motions simulate the natural, magnetic field-generating dynamos inside the Earth's core.
Credit: Jeff Miller
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