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The Gallery of Technological wonders Dinamo In 1866 Werner Siemens discovered the dynamoelectric principle and converted mechanical energy into electrical energy with his dynamo machine. Instead of the permanent magnets of the magneto-electric machines he used electromagnets and the residual field for self-excitation. This marked the beginning of electrical power engineering.   Siemens S.p.A. 1999 - Milano Communication and Marketing Reproduction and use of the images and texts are prohibited.