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Keppel, Francis

(Encyclopedia)Keppel, Francis, 1916–90, American educator, b. New York City. A Harvard graduate, Keppel was named dean of Harvard's Graduate School of Education in 1948. There he introduced television into educat...

Ticknor, George

(Encyclopedia)Ticknor, George tĭkˈnər [key], 1791–1871, American author and teacher, b. Boston, grad. Dartmouth, 1807. In 1815 he went to Germany to study at the Univ. of Göttingen. While abroad he was appoin...

drift

(Encyclopedia)drift, deposit of mixed clay, gravel, sand, and boulders transported and laid down by glaciers. Stratified, or glaciofluvial, drift is carried by waters flowing from the melting ice of a glacier. The ...

composition board

(Encyclopedia)composition board, wood product produced in the form of a board or sheet, formed of cellulose fibers or particles derived from wood or other sources, and used principally as a building material. The o...

states of matter

(Encyclopedia)states of matter, forms of matter differing in several properties because of differences in the motions and forces of the molecules (or atoms, ions, or elementary particles) of which they are composed...

conjunction, part of speech

(Encyclopedia)conjunction, in English, part of speech serving to connect words or constructions, e.g., and, but, and or. Most languages have connective particles similar to English conjunctions. In some languages w...

sintering

(Encyclopedia)sintering, process of forming objects from a metal powder by heating the powder at a temperature below its melting point. In the production of small metal objects it is often not practical to cast the...

Fowler, William Alfred

(Encyclopedia)Fowler, William Alfred, 1911–95, American nuclear astrophysicist, b. Pittsburgh. While a professor at the California Institute of Technology, Fowler studied how chemical elements are formed in nucle...

hardpan

(Encyclopedia)hardpan, condition of the soil or subsoil in which the soil grains become cemented together by such bonding agents as iron oxide and calcium carbonate, forming a hard, impervious mass. It is disadvant...

atomism

(Encyclopedia)atomism, philosophic concept of the nature of the universe, holding that the universe is composed of invisible, indestructible material particles. The theory was first advanced in the 5th cent. b.c. b...