Keywords: Soeren hjorth.jpg Søren Hjorth Promotor of the first Danish railroad 1847 and inventor of the dynamo-electric principle 1854 Sigurd Smith Søren Hjorth Inventor of the Dynamo-Electric Principle Elektrotekniske Forening København 1912 http //www archive org/details/srenhjorthinve00smitrich Online ca 1850 Hans Peter Hansen 1829 “99 PD-old Engravings by Hans Peter Hansen Søren Hjorth |