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Whitefield, George

(Encyclopedia)Whitefield, George, 1714–70, English evangelistic preacher, leader of the Calvinistic Methodist Church. At Oxford, which he entered in 1732, he joined the Methodist group led by John Wesley and Char...

Ten Years War

(Encyclopedia)Ten Years War, 1868–78, struggle for Cuban independence from Spain. Discontent was caused in Cuba by excessive taxation, trade restrictions, and virtual exclusion of native Cubans from governmental ...

Redmond, John Edward

(Encyclopedia)Redmond, John Edward, 1856–1918, Irish nationalist leader. He was elected to Parliament as a Home Rule member in 1881 at the height of the obstructionist program of Charles Parnell. When the Irish n...

Davidson, Donald Herbert

(Encyclopedia)Davidson, Donald Herbert, 1917–2003, American philosopher, b. Springfield, Mass., grad. Harvard (B.A., 1939; Ph.D., 1949). A student of W. V. Quine, Davidson emerged as one of the major figures in p...

Hamilton, Sir William Rowan

(Encyclopedia)Hamilton, Sir William Rowan, 1805–65, Irish mathematician and astronomer, b. Dublin. A child prodigy, he had mastered 13 languages by the age of 13 and was still an undergraduate when he became prof...

Nicol prism

(Encyclopedia)Nicol prism nĭkˈəl [key], optical device invented (1828) by William Nicol of Edinburgh. It consists essentially of a crystal of calcite, or Iceland spar, that is cut at an angle into two equal piec...

Summerhill

(Encyclopedia)Summerhill, radical progressive school in Leiston, Suffolk, England, and the educational movement based on principles developed at the school. The school was founded (1924) by A. S. Neill, who headed ...

surface chemistry

(Encyclopedia)surface chemistry, study of chemical reactions in which the reactants are first adsorbed onto a surface medium (see adsorption) that then acts as a catalyst for the reaction; after the reaction the pr...

spectroscope

(Encyclopedia)spectroscope, optical instrument for producing spectral lines and measuring their wavelengths and intensities, used in spectral analysis (see spectrum). When a material is heated to incandescence it e...

threshing

(Encyclopedia)threshing or thrashing, separation of grain from the stalk on which it grows and from the chaff or pod that covers it. The first known method was by striking the reaped ears of grain with a flail. In ...