Columbia Encyclopedia

(Encyclopedia) Roentgen or Röntgen, Wilhelm Conrad both: rĕntˈgĭn, rŭntˈ–, Ger. vĭlˈhĕlm kônˈrät röntˈgən [key], 1845–1923, German physicist. His notable research in many fields of physics, especi...

(Encyclopedia) Röntgen, Wilhelm Conrad: see Roentgen. ...

(Encyclopedia) Roentgen ray: see X ray.

(Encyclopedia) roentgenium, artificially produced radioactive chemical element; symbol Rg; at. no. 111; mass number of most stable isotope 280; m.p., b.p., sp. gr., and valence unknown. Situated in Group 11 of the p...

(Encyclopedia) Conrad, Joseph, 1857–1924, English novelist, b. Berdichev, Russia (now Berdychiv, Ukraine), originally named Jósef Teodor Konrad Walecz Korzeniowski. Born of Polish parents, he is considered one of...

(Encyclopedia) Sweynheym, Conrad kônˈrät svīnˈhīm [key], fl. 15th cent., early printer. Originally from near Mainz, Germany, Sweynheym with Arnold Pannartz established (c.1464) in the monastery of Subiaco the ...

(Encyclopedia) Weiser, Conrad wīzˈər [key], 1696–1760, American pioneer, b. Württemberg, Germany. Arriving in America in 1710, his family settled in Livingston Manor, N.Y., and later at Schoharie. While still ...

(Encyclopedia) Richter, Conrad rĭkˈtər [key], 1890–1968, American novelist, b. Pine Grove, Pa. After newspaper work in Pennsylvania and Ohio, he moved to New Mexico. Richter's novels treat the American frontier...

(Encyclopedia) Conrad the Red, d. 955, duke of Lotharingia (Lorraine; 944–53). A Franconian adherent of the German king Otto I (later Holy Roman emperor), he was made duke of Lotharingia and married Otto's daughte...

(Encyclopedia) Conrad, Michael Georg mĭkhˈäĕl gāˈôrk kônˈrät [key], 1846–1927, German critic and novelist. With Karl Bleibtreu, he founded (1885) the journal Gesellschaft as a rallying point for German w...