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Stilwell, Joseph Warren

(Encyclopedia)Stilwell, Joseph Warren, 1883–1946, American general, b. Palatka, Fla. Commissioned in the army in 1904, he fought in World War I and later served for 13 years in China. In Feb., 1942, during World ...

pyroclastic flow

(Encyclopedia)pyroclastic flow, turbulent, fluidized mixture of rock, volcanic ash, and hot gas that moves like an avalanche away from a volcanic eruption. A pyroclastic flow may contain a mix of rock fragments ran...

lubrication

(Encyclopedia)lubrication, introduction of a substance between the contact surfaces of moving parts to reduce friction and to dissipate heat. A lubricant may be oil, grease, graphite, or any substance—gas, liquid...

Chalmers, Thomas

(Encyclopedia)Chalmers, Thomas chäˈmərz, chôˈ– [key], 1780–1847, Scottish preacher, theologian, and philanthropist, leader of the Free Church of Scotland. His preaching and his interest in philanthropic wo...

spring, in mechanics

(Encyclopedia)spring, in mechanics, any of several elastic devices used variously to store and to furnish energy, to absorb shock, to sustain the pressure between contacting surfaces, and to resist tensional or com...

Polish Corridor

(Encyclopedia)Polish Corridor, strip of German territory awarded to newly independent Poland by the Treaty of Versailles in 1919. The strip, 20 to 70 mi (32–112 km) wide, gave Poland access to the Baltic Sea. It ...

Burlingame, Anson

(Encyclopedia)Burlingame, Anson bûrˈlĭng-gām [key], 1820–70, American diplomat, b. New Berlin, N.Y. He became a lawyer in Boston and later (1855–61) a Congressman. Defeated for reelection, he was made (1861...

cartilage

(Encyclopedia)cartilage kärˈtəlĭj [key], flexible semiopaque connective tissue without blood vessels or nerve cells. It forms part of the skeletal system in humans and in other vertebrates, and is also known as...

Columbia, U.S. space shuttle

(Encyclopedia)Columbia, U.S. space shuttle. On its 28th flight, on Feb. 1, 2003, after completing a 16-day scientific mission, the spacecraft disintegrated during reentry, killing its seven-person crew. About 16 mi...

anchor

(Encyclopedia)anchor, device cast overboard to secure a ship, boat, or other floating object by means of weight, friction, or hooks called flukes. In ancient times an anchor was often merely a large stone, a bag or...