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photoengraving

(Encyclopedia)photoengraving, photomechanical process in the graphic arts, used principally for reproducing illustrations. The subject is photographed, and the image is recorded on a sensitized metal plate, which i...

Campagnola, Domenico

(Encyclopedia)Campagnola, Domenico dōmĕˈnēkō kämpänyôˈlä [key], 1500–c.1564, painter and engraver. Although Campagnola worked exclusively in Italy, there are documents indicating that he was of German o...

Carriera, Rosalba

(Encyclopedia)Carriera, Rosalba rōzälˈbä kär-rēāˈrä [key], 1675–1757, Italian portrait and miniature painter, one of the greatest of her day. At 24 she had achieved a reputation throughout Italy and abro...

Puvis de Chavannes, Pierre

(Encyclopedia)Puvis de Chavannes, Pierre pyĕr püvēˈ də shävänˈ [key], 1824–98, French mural painter, b. Lyons. In 1844 he went to Paris, where he studied under Delacroix and Couture. His painting War (Ami...

Pyramus and Thisbe

(Encyclopedia)Pyramus and Thisbe pĭrˈəməs, thĭzˈbē [key], in classical mythology, youth and maiden of Babylon, whose parents opposed their marriage. Their homes adjoined, and they conversed through a crevice...

quipus

(Encyclopedia)quipus or khipus kēˈpo͞oz [key], groups of strings, knotted for tally, which were used by the Inca for keeping records and sending messages. The quipu, which is believed to have predated the rise o...

Overbeck, Johann Friedrich

(Encyclopedia)Overbeck, Johann Friedrich yōˈhän frēˈdrĭkh oˈvərbĕk [key], 1789–1869, German religious painter. Expelled from the Vienna Academy because of his opposition to its classicism, he went to Rom...

Ostwald, Wilhelm

(Encyclopedia)Ostwald, Wilhelm vĭlˈhĕlm ôstˈvält [key], 1853–1932, German physical chemist and natural philosopher, b. Riga, Latvia. He was professor of chemistry and director of the chemical laboratory (18...

optical activity

(Encyclopedia)optical activity, the ability of asymmetric compounds to rotate the orientation of planar polarized light. Such compounds and their mirror images are know as enantiomers, or optical isomers. Although ...

Franklin, John Hope

(Encyclopedia)Franklin, John Hope, 1915–2009, the dean of 20th-century African-American historians, b. Rentiesville, Okla., grad. Fisk Univ. (A.B., 1935), Harvard (M.A., 1936; Ph.D., 1941). Franklin served on the...