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Finiguerra, Maso

(Encyclopedia)Finiguerra, Maso or Tommaso mäˈzō, tōm–mäˈzō fēnēgwĕrˈrä [key], 1426–64, Florentine goldsmith and engraver during the Renaissance. In the 1450s he joined with Antonio Pollaiuolo. It is...

Tulun

(Encyclopedia)Tulun tŭlo͞onˈ [key] inhabited atoll, Papua New Guinea, SW Pacific, in the N Solomons Islands chain 45 mi (72 km) NE of Buka. Also known as the Carteret Islands, Carteret Atoll, and Kilinailau, the...

Page, William

(Encyclopedia)Page, William, 1811–85, American historical and portrait painter, b. Albany, N.Y., studied with S. F. B. Morse and at the National Academy of Design. Among his best-known works are Farragut's Triump...

fluxional molecules

(Encyclopedia)fluxional molecules, molecules that exhibit rapid intramolecular rearrangements among their component atoms. As in structural isomerism and tautomerism (see isomer; tautomer), fluxional compounds main...

Haber, Fritz

(Encyclopedia)Haber, Fritz häˈbər [key], 1868–1934, German chemist. He was a professor of physical chemistry at Karlsruhe and became director of the Kaiser Wilhelm Institute at Dahlem in 1911. During World War...

Talbot, William Henry Fox

(Encyclopedia)Talbot, William Henry Fox, 1800–1877, English inventor of photographic processes (see photography, still). A man of enormously versatile intelligence, he invented the “photogenic drawing” proces...

solder

(Encyclopedia)solder sŏdˈər [key], metal alloy used in the molten state as a metallic binder. The type of solder to be used is determined by the metals to be united. Soft solders are commonly composed of lead an...

Betancur Cuartas, Belisario

(Encyclopedia)Betancur Cuartas, Belisario, 1923–2018, Colombian politician. A member of the Conservative party from a working-class provincial family, he served as a legislator in Antioquia dept. before he was el...

shaft sinking

(Encyclopedia)shaft sinking, excavation from the surface of an opening in the earth. Shafts, which are generally vertical, are usually distinguished from tunnels, which are horizontal. Little difficulty is experien...

sunburn

(Encyclopedia)sunburn, inflammation of the skin caused by actinic rays from the sun or artificial sources. Moderate exposure to ultraviolet radiation is followed by a red blush, but severe exposure may result in bl...