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horseshoe

(Encyclopedia)horseshoe, narrow plate, commonly of iron or steel, shaped to fit a horse's hoof and attached to the hoof by nailing it to the inner edge of the horny wall of the hoof. Horseshoes vary from the light ...

sandbur

(Encyclopedia)sandbur or bur grass, any species of the genus Cenchrus of the family Poaceae (grass family), sandy-soil plants of tropical and temperate regions. At maturity the sharp spines and burlike seeds make t...

radiology

(Encyclopedia)radiology, branch of medicine specializing in the use of X rays, gamma rays, radioactive isotopes, and other forms of radiation in the diagnosis and treatment of disease. X ray machines and fluoroscop...

Sowerby, Leo

(Encyclopedia)Sowerby, Leo sōˈərbē [key], 1895–1968, American composer and organist, b. Grand Rapids, Mich. Sowerby studied at the American Conservatory, Chicago, and with Percy Grainger. In 1921 an American ...

diffraction

(Encyclopedia)diffraction, bending of waves around the edge of an obstacle. When light strikes an opaque body, for instance, a shadow forms on the side of the body that is shielded from the light source. Ordinarily...

mezzotint

(Encyclopedia)mezzotint mĕtˈsətĭnt, mĕdˈzə–, mĕzˈə– [key] [Ital.,=halftint], method of copper or steel engraving in tone. A Dutch officer, Ludwig von Siegen, is given credit for the invention of mezzo...

Low, Sir David

(Encyclopedia)Low, Sir David lō [key], 1891–1963, British cartoonist, b. New Zealand. In 1919 Low went to England, where he worked on the London Star (1919–27). Thereafter he successively joined the staff of t...

Kirk, Grayson Louis

(Encyclopedia)Kirk, Grayson Louis, 1903–97, American educator, b. Jeffersonville, Ohio, grad. Miami Univ., 1924, Ph.D. Univ. of Wisconsin, 1930. He taught at Wisconsin from 1929, then became a professor of govern...

Hawley-Smoot Tariff Act

(Encyclopedia)Hawley-Smoot Tariff Act, 1930, passed by the U.S. Congress; it brought the U.S. tariff to the highest protective level yet in the history of the United States. President Hoover desired a limited upwar...

Fiske, Minnie Maddern

(Encyclopedia)Fiske, Minnie Maddern, 1865–1932, American actress, b. New Orleans. Born of a family of actors, she spent her childhood on the stage. In 1890 she married Harrison Grey Fiske, editor of the New York ...