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Joseph Henry


 


Albany, N.Y. 17.December.1797-Washington  13.May.1878 
     Relays
Inventor of the first relay and is able to convey a mile for 1.6 km, in fact invented the telegraph which was not recognized the invention for not having filed the patent, which deposited instead Morse. Discoverer of important principles of electricity including auto. His honor was named the unit the inductance  in 1893.