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17/12/1797 Doorbell inventor is born

13:51

Joseph Henry: Champion of American Science

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Joseph Henry

9:02

Joseph Henry's Rocking Beam Motor

Joseph Henry was an American physicist. His main area of interest was electromagnetism. He discovered the self-inductance independently of Michael Faraday. Henry invented what is today known as the doorbell and electric relay. He served as the first Secretary of the Smithsonian Institution. The SI unit of inductance, henry, is named in his honor.
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    • Essentials 

    • Personal 

    • Biography 

    • Influences in aeronautics 

    • Later years 

    • Legacy 

    • Curriculum vitae 

    • Other honors