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Duyckinck, Evert Augustus

(Encyclopedia)Duyckinck, Evert Augustus dīˈkĭngk [key], 1816–78, American editor and biographer, b. New York City, grad. Columbia, 1835. From 1840 to 1842 he edited Arturus, a Journal of Books and Opinion, and...

Fibonacci, Leonardo

(Encyclopedia)Fibonacci, Leonardo lāōnärˈdō fēbōnätˈchē [key], b. c.1170, d. after 1240, Italian mathematician, known also as Leonardo da Pisa. In Liber abaci (1202, 2d ed. 1228), for centuries a standard...

hallmark

(Encyclopedia)hallmark, mark impressed on silverwork or goldwork to signify official approval of the standard of purity of the metal, also called plate mark. The hallmark was introduced by statute in England in 130...

Jackson, Samuel Macauley

(Encyclopedia)Jackson, Samuel Macauley, 1851–1912, American Presbyterian clergyman and encyclopedist, b. New York City. He was associate editor in the preparation of the original Schaff-Herzog Encyclopedia (1884)...

Callisthenes

(Encyclopedia)Callisthenes kəlĭsˈthənēz [key], c.360–c.327 b.c., Greek historian of Olynthus; nephew of Aristotle. He accompanied Alexander the Great into Asia as the historian of the expedition. At first he...

Brahmagupta

(Encyclopedia)Brahmagupta bräˌməgo͝opˈtə [key], c.598–c.660, Indian mathematician and astronomer. He was among the first to meaningfully discuss the concepts of zero and of negative numbers. He wrote in ver...

Tarbell, Ida Minerva

(Encyclopedia)Tarbell, Ida Minerva, 1857–1944, American author, b. Erie co., Pa., grad. Allegheny College (B.A., 1880; M.A., 1883). One of the leading muckrakers, she is remembered for her investigations of indus...

Bannister, Sir Roger Gilbert

(Encyclopedia)Bannister, Sir Roger Gilbert, 1929–2018, British athlete and neurologist. On May 6, 1954, at Oxford's Iffley Road track, Bannister, a medical student, became the first man to run the mile in less th...

Bamberger, Ludwig

(Encyclopedia)Bamberger, Ludwig lo͞otˈvĭkh bämˈbĕrgər [key], 1823–99, German economist, politician, and journalist. An ardent liberal, he took part in the Revolution of 1848 and was forced to live in exile...

Sloane, T(homas) O'Conor

(Encyclopedia)Sloane, T(homas) O'Conor, 1851–1940, American scientist, lecturer, writer, and periodical editor, Ph.D. Columbia, 1876. Sloane was a member of the editorial staff of the Scientific American, where h...