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Stevens

(Encyclopedia)Stevens, family of U.S. inventors. John Stevens, 1749–1838, b. New York City, was graduated from King's College (now Columbia Univ.) in 1768. He studied law (1768–71) and soon joined his father, a...

York, city, England

(Encyclopedia)York, city and unitary authority (2011 pop. 198,051), N England, at the confluence of the Ouse and Foss rivers. It is located at the historical junction of the three ridings of Yorkshire. York, a rail...

Weld, Theodore Dwight

(Encyclopedia)Weld, Theodore Dwight, 1803–95, American abolitionist, b. Hampton, Conn. In 1825 his family moved to upstate New York, and he entered Hamilton College. While in college he became a disciple of the e...

Seaborg, Glenn Theodore

(Encyclopedia)Seaborg, Glenn Theodore sēˈbôrg [key], 1912–99, American chemist, b. Ishpeming, Mich., grad. Univ. of California at Los Angeles, 1934, Ph.D. Univ. of California at Berkeley, 1937. In 1939, he beg...

London Company

(Encyclopedia)London Company, corporation composed of stockholders residing in and about London, which, together with the Plymouth Company (see Virginia Company), was granted (1606) a charter by King James I to fou...

plutonium

(Encyclopedia)plutonium plo͞otōˈnēəm [key], radioactive chemical element; symbol Pu; at. no. 94; mass no. of most stable isotope 244; m.p. 641℃; b.p. 3,232℃; sp. gr. 19.84 at 20℃; valence +3, +4, +5, or ...

photographic processing

(Encyclopedia)photographic processing, set of procedures by which the latent, or invisible, image produced when a photographic film is exposed to light is made into a permanent visible image. The negative may b...

Reconstruction

(Encyclopedia)Reconstruction, 1865–77, in U.S. history, the period of readjustment following the Civil War. At the end of the Civil War, the defeated South was a ruined land. The physical destruction wrought by t...

Hubble's law

(Encyclopedia)Hubble's law, in astronomy, statement that the distances between galaxies (see galaxy) or clusters of galaxies are continuously increasing and that therefore the universe is expanding. Hubble's law ...

Sherman, William Tecumseh

(Encyclopedia)Sherman, William Tecumseh, 1820–91, Union general in the American Civil War, b. Lancaster, Ohio. Sherman is said by many to be the greatest of the Civil War generals. Sherman was promoted to lie...