Joseph
Henry (1797-1878) was born near Albany, New York. His ambition was to become an
actor until by chance at the age of 16 he happened to read a book of science,
which caused him to devote his life to the acquisition of knowledge. That event
turns out to be the beginning of Henry’s rise as the leading American scientist after Benjamin
Franklin and until Willard Gibbs.
Education
and Research
Joseph
Henry enrolled in the Albany Academy and upon graduation became a teacher
there. Henry’s research led him to experiment with magnets. He actually discovered
electromagnetic induction in America about the same time Michael Faraday
discovered it in England in 1831. Faraday was given the credit because his
results were published first.
In
1832, he joined the faculty of the college of New Jersey, now Princeton and in
1846 joined the Smithsonian Institution.
Joseph Henry |
Electromagnetism
Joseph
Henry however took active interest in electromagnetism. He went beyond Faraday
and continued to research into induction. He used electromagnets to build philosophical
toys, which foreshadowed the electric motor and telegraph.
More
importantly, Henry became famous as the discoverer of the inductance (also
called self-inductance) of a coil and as a developer of the powerful
electromagnets capable of lifting thousands of pounds of weight. He also
developed a device for controlling circuits known as a “relay”.
Recognitions
Joseph
Henry was known as America’s foremost 19th century physicist and the first
secretary general of the newly formed Smithsonian Institution.
1 comment:
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