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Hall effect

(Encyclopedia)Hall effect, experiment that shows the sign of the charge carriers in a conductor. In 1879 E. H. Hall discovered that when he placed a metal strip carrying a current in a magnetic field, a voltage dif...

Ames, Ezra

(Encyclopedia)Ames, Ezra, 1768–1836, American painter, b. Framingham, Mass. Early in his life he worked as a carriage painter, miniaturist, engraver, and decorator, first in Worcester, Mass., and later in Albany,...

Suwannee

(Encyclopedia)Suwannee swôˈnē, swäˈ– [key], river, c.240 mi (390 km) long, rising in the Okefenokee Swamp, SE Ga., and winding generally S through N Fla. to the Gulf of Mexico; it is dredged to accommodate s...

Velikiye Luki

(Encyclopedia)Velikiye Luki vyĭlyēˈkēə lo͞oˈkē [key], city (1989 pop. 114,000), W central European Russia, on the Lovat River. A railroad junction, it has industries producing rolling stock and foodstuffs. ...

Barker, Eugene Campbell

(Encyclopedia)Barker, Eugene Campbell, 1874–1956, American historian, b. Walker co., Tex. His distinguished teaching career, begun in 1899, was almost entirely at the Univ. of Texas. An outstanding social histori...

Leawood

(Encyclopedia)Leawood lēˈwo͝od [key], city (1990 pop. 19,693), Johnson co., NE Kans., a suburb of Kansas City; inc. 1948. An agricultural trade center that has undergone major suburban development, it has busine...

Grodno

(Encyclopedia)Grodno grôdˈnô [key], Belarusian Horodno, city (1990 est. pop. 272,000), capital of Grodno region, NW Belarus, on the Neman River. A river port and an important railway center, it has industries pr...

magnetic resonance

(Encyclopedia)magnetic resonance, in physics and chemistry, phenomenon produced by simultaneously applying a steady magnetic field and electromagnetic radiation (usually radio waves) to a sample of atoms and then a...

Robertson, Sir William Robert

(Encyclopedia)Robertson, Sir William Robert, 1860–1933, British field marshal. He enlisted in the army in 1877 and became an officer in 1888. He was in the intelligence department in India (1892–96) and served ...

Ney, Elisabeth

(Encyclopedia)Ney, Elisabeth or Elisabet nī [key], 1833–1907, German-American sculptor, b. Münster. After studying sculpture at Munich and Berlin, she traveled widely and executed busts of King George V of Hano...