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Parks, Gordon

(Encyclopedia)Parks, Gordon (Gordon Roger Alexander Buchanan Parks), 1912–2006, African-American photographer, filmmaker, writer, and composer, b. Fort Scott, Kans. Parks purchased his first camera in 1938 and be...

Helmholtz, Hermann Ludwig Ferdinand von

(Encyclopedia)Helmholtz, Hermann Ludwig Ferdinand von hĕrˈmän lo͞otˈvĭkh fĕrˈdēnänt fən hĕlmˈhôlts [key], 1821–94, German scientist. Although known especially as a physicist and biologist, he was al...

bursitis

(Encyclopedia)bursitis bərsīˈtəs [key], acute or chronic inflammation of a bursa, or fluid sac, located close to a joint. In response to irritation or injury the bursa may become inflamed, causing pain, restric...

Calisher, Hortense

(Encyclopedia)Calisher, Hortense kălˈĭshər [key], 1911–2009, American author, b. New York City, grad. Barnard College, 1932. Her novels are difficult to categorize, blending deft character analysis with compl...

plaster casting

(Encyclopedia)plaster casting, as a sculpture process, is of three kinds. One employs a waste mold, another a piece mold (both plaster of paris), and the third a gelatin mold; all reproduce the original clay or wax...

Wiesbaden

(Encyclopedia)Wiesbaden vēsˈbäˌdən, vĭsˈ– [key], city (1994 pop. 270,873), capital of Hesse, central Germany, on the Rhine River, at the southern foot of the Taunus Mts. The city, an industrial center and ...

Reynolds number

(Encyclopedia)Reynolds number [for Osborne Reynolds], dimensionless quantity associated with the smoothness of flow of a fluid. It is an important quantity used in aerodynamics and hydraulics. At low velocities flu...

Roach, Hal

(Encyclopedia)Roach, Hal (Harold Eugene Roach, Sr.), 1892–1992, American move producer and director, b. Elmira, N.Y. He entered (1912) the motion-picture industry as an extra, and by 1914 had founded a production...

Rogers, Will

(Encyclopedia)Rogers, Will (William Penn Adair Rogers), 1879–1935, American humorist, b. Oolagah, Indian Territory (now in Oklahoma). In his youth he worked as a cowboy in Oklahoma, and after traveling over the w...

second

(Encyclopedia)second, abbr. sec or s, fundamental unit of time in all systems of measurement. In practical terms, the second is 1/60 of a minute, 1/3,600 of an hour, or 1/86,400 of a day. Since the length of the da...