After Volta came the demonstration by oersted, in Denmark, of the identity of magnetism with electricity.
"Makers of Modern Medicine"
James J. Walsh
oersted the Dane belongs in the same category.
"Makers of Modern Medicine"
James J. Walsh
Despite the many uses made of voltaic cells after Volta's announcement of his "pile" invention in 1800, two decades passed before oersted discovered the magnetic effects of a voltaic circuit.
"The Earliest Electromagnetic Instruments"
Robert A. Chipman