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In the Forschungszentrum Karlsruhe an experiment has been constructed which demonstrates a homogeneous dynamo as is expected to exist in the Earth's interior. This experiment is discussed within the framework of mean-field dynamo theory. The main predictions of this theory are explained and compared with the experimental results. <br><br><b>Key words.</b> Dynamo, geodynamo, dynamo experiment, mean-field dynamo theory, <font face='Symbol'>a</font>-effect