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litmus

(Encyclopedia)litmus, organic dye usually used in the laboratory as an indicator of acidity or alkalinity (see acids and bases). Naturally pink in color, it turns blue in alkali solutions and red in acids. Commonly...

Léger, Fernand

(Encyclopedia)Léger, Fernand fĕrnäNˈ lāzhāˈ [key], 1881–1955, French painter. Léger first studied architecture, then he began to paint, studying briefly at the École des Beaux-Arts. He became known for h...

Lear, Edward

(Encyclopedia)Lear, Edward, 1812–88, English humorist and artist. At 19 he was employed as a draftsman by the London Zoological Society; the paintings of parrots that he produced for The Family of the Psittacidae...

Kline, Franz

(Encyclopedia)Kline, Franz, 1910–62, American painter, b. Wilkes-Barre, Pa. He studied (1937–38) in England, then settled in New York City. His first works were representational, often portraying the industrial...

Karfiol, Bernard

(Encyclopedia)Karfiol, Bernard kärˈfēŏl [key], 1886–1952, American painter, b. Budapest of American parents; educated in Brooklyn, N.Y. He studied at the National Academy of Design in New York City and at Jul...

palmtop

(Encyclopedia)palmtop or hand-held personal computer, lightweight, small, battery-powered, general-purpose programmable computer. It typically had a miniaturized full-function, typewriterlike keyboard for input and...

Percheron horse

(Encyclopedia)Percheron horse pûrˈchərŏnˌ [key], breed of draft horse developed in NW France, originally of Flemish origin, but also containing some Arabian blood (see Arabian horse). For a heavy horse, it has...

Briard

(Encyclopedia)Briard brēärdˈ [key], breed of muscular, wiry working dog whose origins may be traced back to 12th-century France. It stands from 22 to 27 in. (55.9–68.6 cm) high at the shoulder and weighs betwe...

Birkhoff, George David

(Encyclopedia)Birkhoff, George David, 1884–1944, American mathematician, b. Overisel, Mich.; father of Garrett Birkhoff. The son of a physician, he was educated at Harvard (B.A., 1905) and the Univ. of Chicago (P...

soapstone

(Encyclopedia)soapstone or steatite stēˈətīt [key], metamorphic rock of which the characteristic and usually chief mineral is talc, but which also contains varying parts of chlorite, mica, tremolite, quartz, ma...