pat henry

Henry 

Main Entry: hen·ry
Pronunciation: 'hen-rE
Function: noun
Inflected Form: plural henrys or henries
: the practicalmks unit of inductance equal to the self-inductance of a circuit or the mutual inductance of two circuits in which the variation of one ampere per second results in an induced electromotive force ofone volt
Henry, Joseph (1797–1878), American physicist. Henry was a schoolteacher in Albany, New York, and later a professor of mathematics and natural philosophy atPrinceton. He conducted a series of investigations into electric phenomena, particularly those related to magnetism. His first major achievement was building a powerful electromagnet, for which hedeveloped insulated wire in order to make a closely wound coil of several layers. He is also credited with constructing primitive versions of the telegraph and the electric motor. In 1846 he became thefirst secretary and director of the Smithsonian Institution in Washington, D.C. In recognition of his work, his name was given to the henry, the unit of electrical inductance, by internationalagreement in 1893.

henry hen·ry (hěn'rē)
n. pl. hen·rys or hen·ries (-rēz)
Abbr. H
The unit of inductance in which an induced electromotive force of one volt is produced when the current is varied at the rate of one ampere per second.

Henry, Joseph 1797-1878.   American physicist who studied electromagnetic phenomena. He discovered electrical induction independently of Michael Faraday, and constructed a small electromagnetic motor in 1829. He also developed a system of weather forecasting based on meteorological observations. The henry unit of inductance is named for him.