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Harpers Ferry

(Encyclopedia)Harpers Ferry, town (2020 pop. 285), Jefferson co., easternmost W Va., at the confluence of the Shenandoah and Potomac rivers; inc. 1763. The town is a ...

traffic regulation

(Encyclopedia)traffic regulation, control of the movement of vehicles and pedestrians, chiefly on city streets. Formal regulation of motor vehicle traffic was instituted in New York City in 1903; a set of Rules for...

Gramm-Rudman-Hollings Act

(Encyclopedia)Gramm-Rudman-Hollings Act, officially the Balanced Budget and Emergency Deficit Control Act of 1985, U.S. budget deficit reduction measure. The law provided for automatic spending cuts to take effect ...

biofeedback

(Encyclopedia)biofeedback, method for learning to increase one's ability to control biological responses, such as blood pressure, muscle tension, and heart rate. Sophisticated instruments are often used to measure ...

York Factory

(Encyclopedia)York Factory, fur-trading post, NE Man., Canada, on Hudson Bay, at the mouth of the Hayes River, just east of the mouth of the Nelson River. The name was used for several early (late-17th-century) pos...

Stopes, Marie Carmichael

(Encyclopedia)Stopes, Marie Carmichael stōps [key], 1880–1958, British paleobotanist and eugenicist, b. Edinburgh, D.Sc. Univ. of London, Ph.D. Univ. of Munich. She lectured on paleobotany at the universities of...

Goldie, Sir George

(Encyclopedia)Goldie, Sir George (George Goldie Taubman), 1846–1925, British colonial administrator, b. Isle of Man. Goldie entered the Niger River trade in the 1870s, and his company soon dominated trade on the ...

Ellenborough, Edward Law, 1st earl of

(Encyclopedia)Ellenborough, Edward Law, 1st earl of ĕlˈənbûrˌə [key], 1790–1871, British statesman; son of the 1st Baron Ellenborough. He served as president of the Board of Control of the East India Compan...

thyristor

(Encyclopedia)thyristor, semiconductor switch used chiefly in power-control applications. Also called a silicon-controlled rectifier (SCR; see rectifier), it is a variation of the transistor. A thyristor is capable...

mechanized warfare

(Encyclopedia)mechanized warfare, employment of modern mobile attack and defense tactics that depend upon machines, more particularly upon vehicles powered by gasoline and diesel engines. Central to the waging of m...