Joseph Henry

Joseph Henry (December 17 1797 – May 13 1878) was an American scientist. During his lifetime, he was considered the greatest American scientist since Benjamin Franklin. While building electromagnets, he discovered the electromagnetic phenomenon of self-inductance. He also discovered mutual inductance, independently of Faraday, but Faraday was the first to publish his results. His work on the electromagnetic relay was the basis of the electrical telegraph, jointly invented by Morse and Wheatstone.

See also

• Electromagnetism: Henry (Scientific units named after people), Multiple coil magnet
• Published physics papers - On the Production of Currents and Sparks of Electricity from Magnetism and On Electro-Dynamic Induction (extract)
• Lists: List of physicists, Timeline of invention, Timeline of communication technology, List of physics topics
• Other: Gasport, New York, American Philosophical Society