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radar

(Encyclopedia)radar, system or technique for detecting the position, movement, and nature of a remote object by means of radio waves reflected from its surface. Although most radar units use microwave frequencies, ...

ecumenical movement

(Encyclopedia)ecumenical movement ĕkˌyo͞omĕnˈĭkəl, ĕkˌyə– [key], name given to the movement aimed at the unification of the Protestant churches of the world and ultimately of all Christians. During and ...

balance

(Encyclopedia)balance, instrument used in laboratories and pharmacies to measure the mass or weight of a body. A balance functions by measuring the force of gravity that the earth exerts on an object, i.e., its wei...

Greek music

(Encyclopedia)Greek music, the music of the ancient and modern inhabitants of Greece. Dormant for nearly two thousand years, Greek music underwent a musical rebirth in the 19th cent. with the works of the opera c...

Stonehenge

(Encyclopedia)Stonehenge stōnˈhĕnjˌ [key], group of standing stones on Salisbury Plain, Wiltshire, S England. Preeminent among megalithic monuments in the British Isles, it is similar to an older and larger mon...

African art

(Encyclopedia)African art, art created by the peoples south of the Sahara. The predominant art forms are masks and figures, which were generally used in religious ceremonies. The decorative arts, especially in text...

Magna Carta

(Encyclopedia)Magna Carta or Magna Charta [Lat., = great charter], the most famous document of British constitutional history, issued by King John at Runnymede under compulsion from the barons and the church in...

Tolstoy, Leo, Count

(Encyclopedia)Tolstoy, Leo, Count, Rus. Lev Nikolayevich Tolstoi (lyĕf), 1828–1910, Russian novelist and philosopher, considered one of the world's greatest writers. About 1876 the doubts that had beset Tols...

seismology

(Encyclopedia)seismology sīzmŏlˈəjē, sīs– [key], scientific study of earthquakes and related phenomena, including the propagation of waves and shocks on or within the earth by natural or artificially genera...

clock

(Encyclopedia)CE5 A pendulum clock: Weight-driven clock mechanism clock, instrument for measuring and indicating time. Predecessors of the clock were the sundial, the hourglass, and the clepsydra. See also watc...