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pyramid, in geometry

(Encyclopedia)CE5 Pyramid pyramid, in geometry, solid figure bounded by a polygon (the base, or directrix) and the surface generated by a moving line (the generator) passing through a fixed point (vertex) and c...

parachute

(Encyclopedia)parachute, umbrellalike device designed to retard the descent of a falling body by creating drag as it passes through the air. The development of modern aircraft has led to many experiments in the aer...

flight

(Encyclopedia)CE5 Aircraft motions and control surfaces: Yaw, or motion to the left or right, is controlled by the rudder. Pitch, or climbing or dropping, is controlled by the elevators, which move in the same d...

atmosphere

(Encyclopedia)CE5 Atmosphere atmosphere [Gr.,=sphere of air], the mixture of gases surrounding a celestial body with sufficient gravity to maintain it. Although some details about the atmospheres of other plane...

Dahl, Roald

(Encyclopedia)Dahl, Roald däl [key], 1916–90, British writer known for inventive, often macabre children's books and horror-tinged adult fiction. Dahl spurned a university education in favor of world travel, jo...

De Valera, Eamon

(Encyclopedia)De Valera, Eamon āˈmən dĕ vəlârˈə [key], 1882–1975, Irish statesman, b. New York City. He was taken as a child to Ireland. As a young man he joined the movement advocating physical force to ...

Norfolk, cities, United States

(Encyclopedia)Norfolk [1,] [2] nôrˈfək; [2] nôrˈfôkˌ [key]. 1 City (1990 pop. 21,476), Madison co., NE Nebr., on the Elkhorn River; inc. 1881. A trade and railroad center in a fertile farming region, it has ...

Jodhpur

(Encyclopedia)Jodhpur märˈwär [key], former principality, Rajasthan state, NW India. Except for the eastern section, it is largely an arid wasteland. The principality was founded in the 13th cent. by the Rathor ...

Loewy, Raymond Fernand

(Encyclopedia)Loewy, Raymond Fernand, 1893–1986, American designer, b. Paris, France. He emigrated in 1919, settling in New York City; he became a U.S. citizen in 1938. Known as the father of industrial design, L...

Palma

(Encyclopedia)Palma or Palma de Mallorca pälˈmä ᵺā mälyôrˈkä [key], city (1990 pop. 325,120), capital of Majorca island and of Baleares prov., Spain, on the Bay of Palma. It is the chief port and commerci...