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Tyndall, John

(Encyclopedia)Tyndall, John tĭnˈdəl [key], 1820–93, British physicist, b. Ireland. He became (1853) professor of natural philosophy at the Royal Institution and in 1867 succeeded Michael Faraday, his friend an...

special effects

(Encyclopedia)special effects, in motion pictures, cinematographic techniques that create illusions in the audience's minds as well as the illusions created using these techniques. Some common examples are the use ...

Thomson, Sir George Paget

(Encyclopedia)Thomson, Sir George Paget, 1892–1975, English physicist; son of Sir Joseph John Thomson. He was professor of natural philosophy at the Univ. of Aberdeen (1922–30) and from 1930 to 1952 was profess...

Berzelius, Jöns Jakob, Baron

(Encyclopedia)Berzelius, Jöns Jakob, Baron bərzēˈlēəs; Swed. yöns yäˈkôp bĕrsāˈlĭəs [key], 1779–1848, Swedish chemist, M.D. Univ. of Uppsala, 1802. He was noted for his work as teacher at the medic...

Redfield, Robert

(Encyclopedia)Redfield, Robert, 1897–1958, American anthropologist and sociologist, b. Chicago, grad. Univ. of Chicago (B.A., 1920; Ph.D., 1928). He began teaching at the Univ. of Chicago in 1928, later becoming ...

Renner, Karl

(Encyclopedia)Renner, Karl kärl rĕnˈər [key], 1870–1950, Austrian socialist politician. A deputy after 1907, Renner became, following the abdication (Nov., 1918) of Emperor Charles I, the head of the provisio...

Smith, Goldwin

(Encyclopedia)Smith, Goldwin, 1823–1910, English educator, historian, and journalist. Educated at Oxford, he took a prominent part in executing reforms at the university and became (1858) professor of modern hist...

Spengler, Oswald

(Encyclopedia)Spengler, Oswald spĕngˈglər, Ger. ôsˈvält shpĕngˈglər [key], 1880–1936, German historian and philosopher. His studies covered many fields, among them mathematics, science, philosophy, histo...

Sillanpää, Frans Eemil

(Encyclopedia)Sillanpää, Frans Eemil fräns āˈmĭl sĭlˈlänpăˌ [key], 1888–1964, Finnish novelist. As a young man Sillanpää studied natural science at Helsinki and came under the influence of an artisti...

proof, in mathematics

(Encyclopedia)proof, in mathematics, finite sequence of propositions each of which is either an axiom or follows from preceding propositions by one of the rules of logical inference (see symbolic logic). Mathematic...