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kaleidoscope

(Encyclopedia)kaleidoscope kəlīˈdəskōp [key], optical instrument that uses mirrors to produce changing symmetrical patterns. Invented by the Scottish physicist Sir David Brewster in 1816, the device is usually...

beat generation

(Encyclopedia)beat generation, term applied to certain American artists and writers who were popular during the 1950s. Essentially anarchic, members of the beat generation rejected traditional social and artistic f...

Stifter, Adalbert

(Encyclopedia)Stifter, Adalbert äˈdälbĕrt shtĭfˈtər [key], 1805–68, Austrian writer, b. Bohemia. Learned in law, mathematics, and science and accomplished as an artist, he was a tutor to important families...

leprosy

(Encyclopedia)leprosy or Hansen's disease hănˈsənz [key], chronic, mildly infectious malady capable of producing, when untreated, various deformities and disfigurements. It is caused by the rod-shaped bacterium ...

atom

(Encyclopedia)CE5 Bohr-Rutherford atom CE5 Probability distribution of the electron in the hydrogen atom: A. Ground state B. Highly excited state atom [Gr.,=uncuttable (indivisible)], basic unit of matte...

Robert I, French king

(Encyclopedia)Robert I, c.865–923, French king (922–23), son of Count Robert the Strong and younger brother of King Eudes. He inherited from Eudes the territory between the Seine and the Loire rivers. In 922, R...

abacus, in mathematics

(Encyclopedia)CE5 Chinese abacus: Numbers are represented by moving beads to the central crossbar. abacus ăbˈəkəs, əbăkˈ– [key], in mathematics, simple device for performing arithmetic calculations. Th...

Harvey, William Hope

(Encyclopedia)Harvey, William Hope, 1851–1936, American writer on economics, called Coin Harvey, b. Buffalo, Putnam co., W.Va. He studied at Marshall College, practiced law, and interested himself in monetary pro...