Joseph Henry

  • joseph henry
    joseph henry (1879).jpg
    1st secretary of the smithsonian institution
    in office
    1846–1878
    succeeded byspencer fullerton baird
    2nd president of the national academy of sciences
    in office
    1868–1879
    preceded byalexander dallas bache
    succeeded bywilliam barton rogers
    personal details
    born(1797-12-17)december 17, 1797
    albany, new york, u.s.
    diedmay 13, 1878(1878-05-13) (aged 80)
    washington, d.c., u.s.
    nationalityamerican
    spouse(s)harriet henry (née alexander)
    childrenwilliam alexander (1832–1862)
    mary anna (1834–1903)
    helen louisa (1836–1912)
    caroline (1839–1920)
    alma materthe albany academy
    known forelectromagnetic induction, inventor of a precursor to the electric doorbell and electric relay
    scientific career
    fieldsphysics
    institutionsthe albany academy
    the college of new jersey
    smithsonian institution
    columbian college

    joseph henry (december 17, 1797 – may 13, 1878) was an american scientist who served as the first secretary of the smithsonian institution. he was the secretary for the national institute for the promotion of science, a precursor of the smithsonian institution.[1] he was highly regarded during his lifetime. while building electromagnets, henry discovered the electromagnetic phenomenon of self-inductance. he also discovered mutual inductance independently of michael faraday, though faraday was the first to make the discovery and publish his results.[2][3][4] henry developed the electromagnet into a practical device. he invented a precursor to the electric doorbell (specifically a bell that could be rung at a distance via an electric wire, 1831)[5] and electric relay (1835).[6] the si unit of inductance, the henry, is named in his honor. henry's work on the electromagnetic relay was the basis of the practical electrical telegraph, invented by samuel f. b. morse and sir charles wheatstone, separately.

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Joseph Henry
Joseph Henry (1879).jpg
1st Secretary of the Smithsonian Institution
In office
1846–1878
Succeeded bySpencer Fullerton Baird
2nd President of the National Academy of Sciences
In office
1868–1879
Preceded byAlexander Dallas Bache
Succeeded byWilliam Barton Rogers
Personal details
Born(1797-12-17)December 17, 1797
Albany, New York, U.S.
DiedMay 13, 1878(1878-05-13) (aged 80)
Washington, D.C., U.S.
NationalityAmerican
Spouse(s)Harriet Henry (née Alexander)
ChildrenWilliam Alexander (1832–1862)
Mary Anna (1834–1903)
Helen Louisa (1836–1912)
Caroline (1839–1920)
Alma materThe Albany Academy
Known forElectromagnetic induction, Inventor of a precursor to the electric doorbell and electric relay
Scientific career
FieldsPhysics
InstitutionsThe Albany Academy
The College of New Jersey
Smithsonian Institution
Columbian College

Joseph Henry (December 17, 1797 – May 13, 1878) was an American scientist who served as the first Secretary of the Smithsonian Institution. He was the secretary for the National Institute for the Promotion of Science, a precursor of the Smithsonian Institution.[1] He was highly regarded during his lifetime. While building electromagnets, Henry discovered the electromagnetic phenomenon of self-inductance. He also discovered mutual inductance independently of Michael Faraday, though Faraday was the first to make the discovery and publish his results.[2][3][4] Henry developed the electromagnet into a practical device. He invented a precursor to the electric doorbell (specifically a bell that could be rung at a distance via an electric wire, 1831)[5] and electric relay (1835).[6] The SI unit of inductance, the Henry, is named in his honor. Henry's work on the electromagnetic relay was the basis of the practical electrical telegraph, invented by Samuel F. B. Morse and Sir Charles Wheatstone, separately.