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selective service

(Encyclopedia)selective service, in U.S. history, term for conscription. Conscription was established (1863) in the U.S. Civil War, but proved unpopular (see draft riots). The law authorized release from service to...

Schwabe, Samuel Heinrich

(Encyclopedia)Schwabe, Samuel Heinrich zäˈmo͞oĕl hīnˈrĭkh shväbˈə [key], 1789–1875, German apothecary and amateur astronomer. In the hope of discovering a new planet between Mercury and the sun, he made...

electric fish

(Encyclopedia)electric fish, name for various fish that produce electricity by means of organs usually developed from modified muscle tissue. The electric eels of South America are freshwater knifefish unrelated to...

magnet

(Encyclopedia)magnet: see electromagnet; magnetism. ...

Ritz, Walter

(Encyclopedia)Ritz, Walter, 1878–1909, Swiss physicist. He taught at the universities of Zürich and Göttingen. Ritz's combination principle, confirmed by later research, stated that the frequencies of spectral ...

physics

(Encyclopedia)physics, branch of science traditionally defined as the study of matter, energy, and the relation between them; it was called natural philosophy until the late 19th cent. and is still known by this na...

Abel, son of Adam and Eve, in the Bible

(Encyclopedia)Abel, in the Bible, son of Adam and Eve, a shepherd, killed by his older brother, Cain; in the Gospel of St. Matthew, mentioned as the first martyr. ...

Varona y Pera, Enrique José

(Encyclopedia)Varona y Pera, Enrique José ānrēˈkā hōsāˈ värōˈnä ē pāˈrä [key], 1849–1933, Cuban philosopher and vice president of Cuba (1913–17). Varona was a professor at the Univ. of Havana an...

permeability, magnetic

(Encyclopedia)permeability, magnetic: see magnetism; flux, magnetic. ...

magnetite

(Encyclopedia)magnetite măgˈnətīt [key], lustrous black, magnetic mineral, Fe3O4. It occurs in crystals of the cubic system, in masses, and as a loose sand. It is one of the important ores of iron (magnetic iro...