- Henry , Joseph
- (1797–1878) American physicistOne of the first great American scientists, Henry came from a poor background in Albany, New York, and had to work his way through college. He was educated at the Albany Academy, New York, where he first studied medicine, changing to engineering in 1825. A year later he was appointed a professor of mathematics and physics at Albany. In 1832 he became professor of natural philosophy at Princeton (then the College of New Jersey) where he taught physics, chemistry, mathematics, and geological sciences, and later astronomy and architecture.Henry is noted for his work on electricity. In 1829 he developed a greatly improved form of the electromagnet by insulating the wire that was to be wrapped around the iron core, thus allowing many more coils, closer together, and greatly increasing the magnet's power. Through this work he discovered, in 1830, the principle of electromagnetic induction. Soon after, and quite independently, Michael Faraday made the same observation and published first. Faraday is thus credited with the discovery but Henry has the unit of inductance (the henry) named for him. However, Henry did publish in 1832 – prior to Faraday and Heinrich Lenz – his discovery of self-induction (in which the magnetic field from a changing electric current induces an electromotive force opposing the current). Earlier (in 1829) he had invented and constructed the first practical electric motor. In 1835 he developed the electric relay in order to overcome the problem of resistance that built up in long wires. This device had an immediate social impact for it was the key step in the invention of the long-distance telegraph, which played a large part in the opening up of the North American continent. In 1846, he became the first secretary of the Smithsonian Institution, which he formed into an extremely efficient body for liaison between scientists and government support of their research. He also did work on solar radiation and on sunspots.
Scientists. Academic. 2011.
Look at other dictionaries:
Henry,Joseph — Henry, Joseph. 1797 1878. American physicist who performed extensive studies of electromagnetic phenomena. * * * … Universalium
Henry, Joseph — born Dec. 17, 1797, Albany, N.Y., U.S. died May 13, 1878, Washington, D.C. U.S. physicist. He aided Samuel F.B. Morse in developing the telegraph. He discovered several important principles of electricity, including self induction. He observed… … Universalium
Henry, Joseph — (17 dic. 1797, Albany, N.Y., EE.UU.–13 may. 1878, Washington, D.C.). Físico estadounidense. Ayudó a Samuel F.B. Morse a desarrollar el telégrafo. Descubrió varios principios importantes de la electricidad, como la autoinducción. Observó la… … Enciclopedia Universal
Henry Joseph Napoléon Lambertz — (* 22. Januar 1834 in Aachen; † 22. März 1898 in Burtscheid) war der Gründer der Aachener Printenfabrik Henry Lambertz. Inhaltsverzeichnis 1 Leben 1.1 Herkunft 1.2 Ausbildung … Deutsch Wikipedia
Henry Joseph Clarke — Henry Joseph Clarke, QC (* 7. Juli 1833 in Donegal, Irland; † 13. September 1889 in Medicine Hat, Alberta) war ein kanadischer Politiker und Rechtsanwalt. Er war Premiermini … Deutsch Wikipedia
Henry Joseph O'Leary — (March 13 1879 ndash; March 5 1938) was the fifth Bishop of the Roman Catholic Diocese of Charlottetown, and later became the third Archbishop of the Archdiocese of Edmonton.Born in Richibucto, New Brunswick to Henry O Leary and Mary O Leary, he… … Wikipedia
Henry Joseph Grayson — (9 May 1856 – 21 March 1918) was a designer of a machine for ruling diffraction gratings and scientist.Grayson was born in Worrall, near Sheffield, Yorkshire, England, in 1856 or early in 1857. He came of a family of market gardeners, arrived in… … Wikipedia
Henry Joseph Mansell — (* 10. Oktober 1937 in New York City) ist Erzbischof von Hartford. Leben Henry Joseph Mansell empfing am 19. Dezember 1962 die Priesterweihe und wurde in den Klerus des Erzbistums New York inkardiniert. Johannes Paul II. ernannte ihn am 24.… … Deutsch Wikipedia
Henry Joseph Steele — (May 10, 1860 ndash;March 19, 1933) was a Democratic member of the U.S. House of Representatives from Pennsylvania.Henry J. Steele was born in Easton, Pennsylvania. He graduated from Stevens College of Business in 1875. He studied law, was… … Wikipedia
Henry Joseph Shindika — Pas d image ? Cliquez ici. Situation actuelle Club actuel … Wikipédia en Français