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Gutenberg, Johann

(Encyclopedia)Gutenberg, Johann go͞oˈtənbərg, Ger. yōˈhän go͞oˈtənbĕrk [key], c.1397–1468, German inventor and printer, long credited with the invention of a method of printing from movable type, inclu...

ballade

(Encyclopedia)ballade bəlädˈ [key], in literature, verse form developed in France in the 14th and 15th cent. The ballade usually contains three stanzas of eight lines with three rhymes and a four-line envoy (a s...

tangent

(Encyclopedia)tangent, in mathematics. 1 In geometry, the tangent to a circle or sphere is a straight line that intersects the circle or sphere in one and only one point. For other curves and surfaces the tangent l...

Kisangani

(Encyclopedia)Kisangani kēsangäˈnē [key], formerly Stanleyville, city (1996 est. pop. 500,000), capital of Tshopo prov., N central Congo (Kinshasa), a port on the Congo River. The city is the terminus of steame...

robotics

(Encyclopedia)robotics, science and technology of general purpose, programmable machine systems. Contrary to the popular fiction image of robots as ambulatory machines of human appearance capable of performing almo...

Plimsoll, Samuel

(Encyclopedia)Plimsoll, Samuel plĭmˈsəl [key], 1824–98, English reformer. Plimsoll was particularly interested in the welfare of sailors. As a member of Parliament (1868–80) he secured legislation limiting t...

Zeeman effect

(Encyclopedia)Zeeman effect, splitting of a single spectral line (see spectrum) into a group of closely spaced lines when the substance producing the single line is subjected to a uniform magnetic field. The effect...

Girard

(Encyclopedia)Girard jĭrärdˈ [key], city (2020 pop. 9,081), Trumbull co., NE Ohio, adjacent to Youngstow...

geochemistry

(Encyclopedia)geochemistry, study of the chemical changes on the earth. More specifically, it is the study of the absolute and relative abundances of chemical elements in the minerals, soils, ores, rocks, water, an...

Whitby, Synod of

(Encyclopedia)Whitby, Synod of, called by King Oswy of Northumbria in 663 at Whitby, England. Its purpose was to choose between the usages of the Celtic and Roman churches, primarily in the matter of reckoning the ...