Columbia Encyclopedia

Search results

500 results found

Prefixes for Basic Metric Units (table)

(Encyclopedia)Prefixes for Basic Metric Units Multiples Fractions ...

Penck, Albrecht

(Encyclopedia)Penck, Albrecht älˈbrĕkht pĕngk [key], 1858–1945, German geographer and geologist. He was professor at the Univ. of Vienna (1885–1906) and at the Univ. of Berlin (1906–26) and was director (...

Abbot, Charles Greeley

(Encyclopedia)Abbot, Charles Greeley, 1872–1973, American astrophysicist, b. Wilton, N.H. He was acting director in 1896 and director in 1907 of the astrophysical observatory of the Smithsonian Institution; he wa...

Stephen, Sir James

(Encyclopedia)Stephen, Sir James, 1789–1859, British colonial administrator; father of Leslie and James Fitzjames Stephen. He served (1825–35) as permanent counsel to the colonial office and Board of Trade and ...

Hough, George Washington

(Encyclopedia)Hough, George Washington hŭf [key], 1836–1909, American astronomer, b. Montgomery co., N.Y., grad. Union College, 1856. He discovered 627 double stars and made systematic studies of the surface of ...

anthropometry

(Encyclopedia)anthropometry ănthrəpŏmˈətrē [key], technique of measuring the human body in terms of dimensions, proportions, and ratios such as those provided by the cephalic index. Once the standard approach...

Laurent, Auguste

(Encyclopedia)Laurent, Auguste ōgüstˈ lōräNˈ [key], 1808–53, French organic chemist. He devised a systematic nomenclature for organic chemistry. His studies on naphthalene and its chlorination products led ...

Messier catalog

(Encyclopedia)Messier catalog mĕsyāˈ [key], systematic list of nebulae and star clusters. A first list, compiled and published in 1771 by Charles Messier, contained 45 objects. The final list, published in 1784,...

Willughby, Francis

(Encyclopedia)Willughby, Francis wĭlˈəbē [key], 1635–72, English naturalist. He is known especially for his early systematic work on birds and fishes, in which he made some of the most important contributions...

neural network

(Encyclopedia)neural network or neural computing, computer architecture modeled upon the human brain's interconnected system of neurons. Neural networks imitate the brain's ability to sort out patterns and learn fr...