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Hall effect

(Encyclopedia)Hall effect, experiment that shows the sign of the charge carriers in a conductor. In 1879 E. H. Hall discovered that when he placed a metal strip carrying a current in a magnetic field, a voltage dif...

Australian Ballet

(Encyclopedia)Australian Ballet, national ballet company of Australia, founded in Melbourne in 1962; its school was established in 1964. The company drew on the tradition established (1940) by Edouard Borovansky of...

Zwicky, Fritz

(Encyclopedia)Zwicky, Fritz tsvĭkˈē [key], 1898–1974, Swiss-American astrophysicist, b. Bulgaria, educated at Zürich. Associated with the California Institute of Technology after his arrival in the United Sta...

Bürgi, Joost

(Encyclopedia)Bürgi, Joost or Jost, 1552–1632, Swiss mathematician and instrument maker. As the official clockmaker (1579–92) to Duke Wilhelm IV of Hesse-Kassell, he developed the first clock with a minute han...

Henry IV, Holy Roman emperor and German king

(Encyclopedia)Henry IV, 1050–1106, Holy Roman emperor (1084–1105) and German king (1056–1105), son and successor of Henry III. He was the central figure in the opening stages of the long struggle between the ...

Oberth, Hermann Julius

(Encyclopedia)Oberth, Hermann Julius, 1894–1989, Austro-German astronautical pioneer, b. Hermannstadt, Austria-Hungary (now Sibiu, Romania). Beginning his studies in astronautics before World War I, he first prop...

Lenau, Nikolaus

(Encyclopedia)Lenau, Nikolaus nēmpsh ādˈlər fən shtrāˈlənou [key], 1802–50, Austrian romantic poet, b. Hungary. He is considered Austria's chief lyric poet. Pessimism and melancholy dominate his work, whi...

Tristram and Isolde

(Encyclopedia)Tristram and Isolde trĭsˈtrəm, ĭsōlˈdə, ĭzōlˈ– [key], medieval romance. The earliest extant version (incomplete) was written (c.1185) by Thomas of Britain in Anglo-Norman French verse. Abo...

Otto, Austrian archduke

(Encyclopedia)Otto: see Hapsburg, Otto von.

Siebold, Philipp Franz van

(Encyclopedia)Siebold, Philipp Franz van fēˈlĭp fränts fen zēˈbôlt [key], 1796–1866, German naturalist and physician; son of A. E. von Siebold. He was noted for his studies of the natural history, ethnogra...