Used with
permission of Maiken Naylor, University at Buffalo, Buffalo, NY, USA,
http://ublib.buffalo.edu/libraries/units/sel/exhibits/stamps
The connection between electricity and magnetism was first demonstrated by Hans Christian Oersted (1777-1851). He brought a magnetic needle near a wire which was carrying an electric current. The needle was deflected at right angles to the wire, as is shown on this Danish stamp.