Biographical notes
Scientists index
William SturgeonArago



Joseph Henry


Albany, N.Y. 17.December.1797-Washington 13.May.1878
1832 Self-induction, relè

Inventor of the first one relè and succeeds to transmit for a 1,6 mile Km, invented of fact also the telegraph to which the invention was not recognized in order not to have deposited the license, that it deposited instead Vices. Important discoverer principles of the electricity between which the self-induction. In its honor it has been called the unit of the inductance in 1893.
electromagnet 1831 experiment with electromagnet