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Mendelssohn, Moses

(Encyclopedia)Mendelssohn, Moses mĕnˈdəlsən, Ger. mōˈzĕs mĕnˈdəls-zōnˌ [key], 1729–86, German-Jewish philosopher; grandfather of Felix Mendelssohn. He was a leader in the movement for cultural assimil...

Osterman, Andrei Ivanovich, Count

(Encyclopedia)Osterman, Andrei Ivanovich, Count əndrāˈ ēväˈnəvĭch əstyĭrmänˈ [key], 1686–1747, Russian statesman, b. Germany. His original name was Heinrich Johann Friedrich Ostermann. Under Czar Pete...

Turnverein

(Encyclopedia)Turnverein to͝ornˈfərīn [key], society of a type originated in Prussia by Friedrich Ludwig Jahn. The first hall of such a society was built in 1811 on the Hasenheide athletic grounds, near Berlin....

Menger, Carl

(Encyclopedia)Menger, Carl kärl mĕngˈər [key], 1840–1921, Austrian economist, a founder of the Austrian school of economics. He was professor of economics at the Univ. of Vienna from 1873 until 1903, when he ...

X-ray crystallography

(Encyclopedia)X-ray crystallography, the study of crystal structures through X-ray diffraction techniques. When an X-ray beam bombards a crystalline lattice in a given orientation, the beam is scattered in a defini...

Riemann, Bernhard

(Encyclopedia)Riemann, Bernhard (Georg Friedrich Bernhard Riemann) gāˈôrk frēˈdrĭkh bĕrnˈhärt rēˈmän [key], 1826–66, German mathematician. He studied at the universities of Göttingen and Berlin and w...

Sturm und Drang

(Encyclopedia)Sturm und Drang shto͝orm o͝ont dräng [key] or Storm and Stress, movement in German literature that flourished from c.1770 to c.1784. It takes its name from a play by F. M. von Klinger, Wirrwarr; od...

yttrium

(Encyclopedia)yttrium ĭtˈrēəm [key] [for Ytterby, a town in Sweden], metallic chemical element; symbol Y; at. no. 39; at. wt. 88.90585; m.p. about 1,522℃; b.p. 3,338℃; sp. gr. about 4.45; valence +3. Yttriu...

hardness

(Encyclopedia)hardness, property of matter commonly described as the resistance of a substance to being scratched by another substance. The degree of hardness is relative, different substances being compared with o...

Göttingen

(Encyclopedia)Göttingen götˈĭng-ən [key], city, Lower Saxony, central Germany, on the Leine River. It is ...