Henry is highly regarded for his research in the field of electromagnetism where he discovered the phenomenon of self-inductance. Joseph Henry, who became Secretary of the Smithsonian upon its establishment in 1846, was the first in a long line of scientists selected to lead the Institution. Joseph Henry took what he had learned a step further and in 1831, created one of the first machines to use electromagnetism for motion. Courtney Esposito, "A Forgotten History: Alfred Vail and Samuel Morse," The Bigger Picture (blog), Smithsonian Institution Archives, May 24, 2011. He was the secretary for the National Institute for the Promotion of Science, a precursor of the Smithsonian Institution. Joseph Henry (1797-1878), American physicist and electrical experimenter, was primarily important for his role in the institutional development of science in America. In 1830, when he was an instructor in mathematics at The Albany Academy (New York), Joseph Henry (1797-1878) was the first to observe the phenomena of electromagnetic mutual- and self-induction (the production of a voltage in a wire as a result of a … Biography. One of Henry's Albany Academy students reported seeing Henry succeed with a circuit one-and-a-half miles long.4, Henry continued to develop more powerful electromagnets and demonstrated to his students a way in which mechanical effects could be produced at a much longer range than previously realized. The field of electromagnetism was only six years old when Henry began teaching at the Albany Academy in New York. At the far end of the wire, an energized electromagnet attracted one end of a bar magnet suspended on a pivot, which caused the other end to strike a bell. The challenge in developing a motor was to use a battery current to produce not only a mechanical effect, but continuous mechanical movement. It is our sad duty to chronicle the death of Melville Madison Bigelow in Boston on May 4, 1921. When Joseph used his discovery of insulating wires and combined that with using multiple short pieces of wire to incre… Eager to demonstrate electromagnetic phenomena to his students, Henry built upon the work of English scientist William Sturgeon, who in 1825 discovered that wrapping a wire around an iron core enhanced the magnetic effect. Working in England, Michael Faraday was the first to report success in November 1831. Henry's work in electromagnetism not only made important contributions to science, but helped lay the groundwork for modern industry and telecommunications. Five years later an American inventor named Joseph Henry (1797 to 1878) made a far more powerful version of the electromagnet. His chief scientific contributions were in the field of electromagnetism, where he discovered the phenomenon of self-inductance. He becomes the first to construct an electromagnet formed by tightly wrapping multiple coils of an … ", The challenge in devising an electromagnetic telegraph was not to produce continuous motion, but rather mechanical action at a great distance from a battery. https://history.aip.org › history › exhibits › gap › Henry › Henry.html He explained electrolysis in terms of electrical forces and also introduced concepts such as field and lines of force, which not only were fundamental to understanding electrical and magnetic interactions but also formed the basis of further … 1827 Georg Ohm Ohm’s law Ohm discovers that the current in a circuit is proportional to voltage divided by resistance. His parents were Scottish immigrants and the family was quite impoverished during most of Henry’s younger years. He also discovered mutual inductance independently of Michael Faraday, though Faraday was the first to make the discovery and publ He did not publish a description of this primitive relay, which Morse learned of through an intermediary and which was critical in Morse's development of the telegraph, but mentioned it to Charles Wheatstone in England in 1837 and claimed to have demonstrated it to his Princeton students several years earlier. Contributions To Electricity And Magnetism... [Henry, Joseph, American Philosophical Society] on Amazon.com. While building electromagnets, Henry discovered the electromagnetic phenomenon of self-inductance. On April 27, 2007, John Rigden, Chair of the APS Historic Sites Committee, presented the Albany Academy in Albany, NY with a plaque to honor physicist Joseph Henry for his pioneering work performed there on electromagnetism, in particular the discovery of self-inductance. He also discovered important principles of electromagnetic induction, for which he was honored in 1893, when the International Congress of Electricians named the unit of induction the "henry." Joseph Henry's electromagnetic motor. Using these electromagnets to demonstrate both dramatic and subtle effects to his students and to explore electromagnetism in the laboratory, he developed the first motor based on magnetic attraction and repulsion (a forerunner of a modern DC or direct current motor) and a primitive form of the electromagnetic telegraph. Henry's reciprocating motor consisted of a straight electromagnet balanced on an axis with its ends above the north poles of two vertical permanent magnets. 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