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Tatum, Art

(Encyclopedia)Tatum, Art tāˈtəm [key], 1910–56, American jazz pianist, b. Toledo, Ohio. Born with cataracts in both eyes, Tatum remained virtually blind for life. He read music in Braille, but his sensitive ea...

Roman art

(Encyclopedia)Roman art, works of art produced in ancient Rome and its far-flung provinces. The continued striving after three-dimensional illusionist effects revealed in the various phases of painting was dup...

African art

(Encyclopedia)African art, art created by the peoples south of the Sahara. The predominant art forms are masks and figures, which were generally used in religious ceremonies. The decorative arts, especially in text...

Coles, Robert

(Encyclopedia)Coles, Robert, 1929–, American child psychiatrist, b. Boston, grad. Harvard (B.A., 1950), Columbia College of Physicians and Surgeons (M.D., 1954). He began working with children while in the air fo...

Halley's comet

(Encyclopedia)Halley's comet or Comet Halley hălˈē, hāˈlē [key], periodic comet named for Edmond Halley, who observed it in 1682 and identified it as the one observed in 1531 and 1607. Halley did not live to ...

Callahan, Harry Morey

(Encyclopedia)Callahan, Harry Morey, 1912–99, American photographer, b. Detroit. Self-taught, he began taking pictures (1938) as a hobby and, inspired by the work of Ansel Adams, began to produce professional-qua...

Arbus, Diane

(Encyclopedia)Arbus, Diane ärˈbəs [key], 1923–71, American photographer, b. New York City. For nearly 20 years Arbus operated a successful fashion photography studio with her husband, Allan Arbus. She studied ...

oxalic acid

(Encyclopedia)oxalic acid ĕthˌāndīōĭk [key], HO2CCO2H, a colorless, crystalline organic carboxylic acid that melts at 189℃ with sublimation. Oxalic acid and oxalate salts are poisonous. Oxalic acid is found...

stereoscope

(Encyclopedia)stereoscope stĕrˈēəskōpˌ [key], optical instrument that presents to a viewer two slightly differing pictures, one to each eye, to give the effect of depth. In normal vision the two eyes, being a...

prospecting

(Encyclopedia)prospecting, search for mineral deposits suitable for mining. Modern prospecting has replaced earlier methods based on chance or superstition (e.g., use of the divining rod) with others based on a sci...