Columbia Encyclopedia

Search results

500 results found

Glauber's salt

(Encyclopedia)Glauber's salt, common name for sodium sulfate decahydrate, Na2SO4·10H2O; it occurs as white or colorless monoclinic crystals. Upon exposure to fairly dry air it effloresces, forming powdery anhydrou...

Bernstorff, Andreas Peter

(Encyclopedia)Bernstorff, Andreas Peter ändrāˈäs pāˈtər bĕrnsˈtôrf [key], 1735–97, Danish politician; nephew of Johann Hartwig Ernst Bernstorff. Made (1773) foreign minister after Struensee's fall from ...

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...

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...

Frescobaldi, Girolamo

(Encyclopedia)Frescobaldi, Girolamo jērôˈlämō frāskōbälˈdē [key], 1583–1643, Italian organist and composer. He became organist at St. Peter's in Rome in 1608, where huge crowds came during most of his l...

Michel, Hartmut

(Encyclopedia)Michel, Hartmut mĭkhˈəl [key], 1948–, German biochemist, Ph.D. Univ. of Würzburg, 1977. Michel was the first person to reduce a photosynthetic action center, which is a four-protein complex, to ...

Marshall Islands

(Encyclopedia)Marshall Islands, officially Republic of the Marshall Islands, independent nation (2015 est. pop. 53,000), in the central Pacific. The Marshalls extend over a 700-mi (1,130-km) area and comprise two m...

Richelieu, Armand Jean du Plessis, duc de

(Encyclopedia)Richelieu, Armand Jean du Plessis, duc de (Cardinal Richelieu) plĕsēˈ dük də rēshəlyöˈ [key], 1585–1642, French prelate and statesman, chief minister of King Louis XIII, cardinal of the Ro...