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photoelectric cell

(Encyclopedia)CE5 Photoelectric cell: Light causes a photosensitive surface to emit electrons, which flow as current to the positive terminal. A galvanometer measures the current and thus indicates light intensi...

Wilkes, Charles

(Encyclopedia)Wilkes, Charles, 1798–1877, American naval officer and explorer, b. New York City, educated by his father. In 1815 he entered the merchant service and received (1818) an appointment as a midshipman....

interference

(Encyclopedia)CE5 Constructive interference: Two crests or two troughs meet and combine (A, B, C). Destructive interference: A crest and a trough meet and cancel each other (D, E, F). interference, in physics, ...

Luthuli, Albert John

(Encyclopedia)Luthuli, Albert John lətho͞oˈlē [key], 1898?–1967, African political leader in the Republic of ...

Maathai, Wangari Muta

(Encyclopedia)Maathai, Wangari Muta wän-gäˈrē mātīˈ [key], 1940–2011, Kenyan environmental...

Narayan, R. K.

(Encyclopedia)Narayan, R. K. (Rasipuram Krishnaswami Narayan) nərīˈyän [key], 1906–2001, Indian novelist, b. Madras (now Chennai). Narayan, who wrote in English, published his first novel, Swami and Friends, ...

Thurber, James

(Encyclopedia)Thurber, James, 1894–1961, American humorist, b. Columbus, Ohio, studied at Ohio State Univ. After working on various newspapers he served on the staff of the New Yorker from 1927 to 1933 and was la...

Tobit

(Encyclopedia)Tobit tōˈbĭt [key] [Gr. from Heb. Tobijah=God is my good], book of the Old Testament Apocrypha, not included in the Hebrew Bible. It is the account of Tobit, a devout Jew in exile, and of his son T...

beat generation

(Encyclopedia)beat generation, term applied to certain American artists and writers who were popular during the 1950s. Essentially anarchic, members of the beat generation rejected traditional social and artistic f...

Cook, Frederick Albert

(Encyclopedia)Cook, Frederick Albert, 1865–1940, American explorer and physician, b. Sullivan co., N.Y. Cook early became interested in the arctic and accompanied the expedition of Robert E. Peary in 1891–92 as...