(Encyclopedia) record player or phonograph, device for reproducing sound that has been recorded as a spiral, undulating groove on a disk. This disk is known as a phonograph record, or simply a record…
(Encyclopedia) searchlight, device, usually swiveled, using a lens and reflecting surface to direct a powerful beam of light of nearly parallel rays. In 1892 such apparatus was used along the English…
(Encyclopedia) thermionic emissionthermionic emissionthûrmˌīŏnˈĭk [key], emission of electrons or ions by substances that are highly heated, the charged particles being called thermions. The number…
(Encyclopedia) Hsüan-tsangHsüan-tsangshüän-dzäng [key], 605?–664, Chinese Buddhist scholar and translator. He early entered monastic life and later traveled in China, teaching and studying. Between…
(Encyclopedia) Yüan Shih-kaiYüan Shih-kaiyüänˈ shēˈ-kīˈ [key], 1859–1916, president of China (1912–16). From 1885 to 1894 he was the Chinese resident in Korea, then under Chinese suzerainty. He…
(Encyclopedia) Villard, HenryVillard, Henryvĭlärdˈ [key], 1835–1900, American journalist and financier, b. Germany. His first name was originally Hilgard. He attended universities in Germany, and…
(Encyclopedia) May Fourth Movement (1919), first mass movement in modern Chinese history. On May 4, about 5,000 university students in Beijing protested the Versailles Conference (Apr. 28, 1919)…
(Encyclopedia) microphone, device for converting sound into electrical energy, used in radio broadcasting, recording, and sound amplifying systems. Its basic component is a diaphragm that responds to…
(Encyclopedia) robot or automatonrobotôtämˈətänˌ [key] mechanical device designed to perform the work generally done by a human being. The Czech dramatist Karel Čapek popularized the expression […
(Encyclopedia) infrared astronomy, study of celestial objects by means of the infrared radiation they emit, in the wavelength range from about 1 micrometer to about 1 millimeter. All objects, from…
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