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Hess, Rudolf

(Encyclopedia)Hess, Rudolf, 1894–1987, German National Socialist leader, b. Alexandria, Egypt; son of a German merchant. In 1920 he became an ardent follower of Adolf Hitler and after the Munich “beer-hall puts...

Smithson, Robert

(Encyclopedia)Smithson, Robert, 1938–73, American sculptor, b. Passaic, N.J. After first making modular, serial sculpture, Smithson began to design large-scale earthworks (see land art) in the 1960s. Smithson res...

sonic boom

(Encyclopedia)CE5 Sonic boom wave pattern from a supersonic aircraft and variation in pressure sonic boom, shock wave produced by an object moving through the air at supersonic speed, i.e., faster than the spee...

Pentagon, the

(Encyclopedia)Pentagon, the, building accommodating the U.S. Dept. of Defense. Located in Arlington, Va., across the Potomac River from Washington, D.C., the Pentagon is a vast five-sided building designed by Los A...

Maxim

(Encyclopedia)Maxim măkˈsĭm [key], name of a family of inventors and munition makers. Sir Hiram Stevens Maxim, 1840–1916, was born near Sangerville, Maine. After launching on a career of inventing, he moved to...

altimeter

(Encyclopedia)altimeter ăltĭmˈĭtər, ălˈtĭmēˌtər [key], device for measuring altitude. The most common type is an aneroid barometer calibrated to show the drop in atmospheric pressure in terms of linear e...

turbulence

(Encyclopedia)turbulence, state of violent or agitated behavior in a fluid. Turbulent behavior is characteristic of systems of large numbers of particles, and its unpredictability and randomness has long thwarted a...

Kassel

(Encyclopedia)Kassel käsˈəl [key], city (1994 pop. 202,160), Hesse, central Germany, on the Fulda River. It is an industrial, rail, and cultural center. Manufactures include textiles, optical and precision instr...

Whitehead, Gustave Albin

(Encyclopedia)Whitehead, Gustave Albin, 1874–1927, German inventor and airplane pioneer, b. Gustav Albin Weisskopf. He immigrated to the United States in 1893 and later Americanized his name, but never became a c...

Martin, Glenn Luther

(Encyclopedia)Martin, Glenn Luther, 1886–1955, American aviation pioneer, b. Macksburg, Iowa. Martin built his first airplane in 1909, and in 1912 set the world over-water record, flying from mainland California ...