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Kirkwood gaps

(Encyclopedia)Kirkwood gaps, regions in the asteroid belt within which few asteroids are found. Astronomer Daniel Kirkwood first observed (1886) that few asteroids had an orbital period close to 1⁄2, 1⁄3, or 2�...

Langevin, Paul

(Encyclopedia)Langevin, Paul läNzhəvăNˈ [key], 1872–1946, French physicist and chemist. He was professor of experimental physics at the Collège de France from 1909 and at the École municipale de Physique e...

Lindley, John

(Encyclopedia)Lindley, John, 1799–1865, English botanist and horticulturist. He organized the first flower shows in England and was influential in preserving the Royal Gardens at Kew (see Kew Gardens). In 1829 he...

Arrhenius, Svante August

(Encyclopedia)Arrhenius, Svante August sfänˈtə, ärāˈnēəs [key], 1859–1927, Swedish chemist. He was a professor of physics in Stockholm in 1895 and became director of the Nobel Institute for Physical Chemi...

Frankel, Charles

(Encyclopedia)Frankel, Charles, 1917–79, American philosopher, b. New York City, grad. Columbia 1937, Ph.D., 1946. A teacher at Columbia since 1939, he became Old Dominion professor of philosophy and public affai...

Goddard, Robert Hutchings

(Encyclopedia)Goddard, Robert Hutchings, 1882–1945, American physicist and rocket expert, b. Worcester, Mass., grad. Worcester Polytechnic Institute (B.S., 1908), Ph.D. Clark Univ., 1911. From 1914 he was associa...

Giannotti, Donato

(Encyclopedia)Giannotti, Donato dōnäˈtō jän-nôtˈtē [key], 1492–1573, Italian political theorist, b. Florence. He studied at Pisa and in 1527 became secretary of the supreme council of the Florentine repub...

Eysenck, Hans Jurgen

(Encyclopedia)Eysenck, Hans Jurgen häns yo͝orˈgən īˈsĕngk [key], 1916–97, British psychologist. Best known for his theory of human personality, Eysenck suggested that personality is biologically determined...

Gassendi, Pierre

(Encyclopedia)Gassendi, Pierre pyĕr gäsäNdēˈ [key], 1592–1655, French philosopher and scientist. A teacher and priest, Gassendi taught at Digne, Aix, and the Royal College at Paris and held several church of...

Fellenberg, Philipp Emanuel von

(Encyclopedia)Fellenberg, Philipp Emanuel von fēˈlĭp āmäˈno͞oĕl fən fĕlˈənbĕrkh [key], 1771–1844, Swiss educator and agriculturist. He purchased (1799) an estate, Hofwyl (near Bern), where he put int...