Columbia Encyclopedia
Search results
500 results found
E, letter of the alphabet
(Encyclopedia)E, fifth letter of the alphabet. It is a usual symbol for a mid-front vowel, such as ĕ in the English step. A mid-front vowel was represented by Greek epsilon [Gr.,=e without the aspirate], to which ...fifth force
(Encyclopedia)fifth force, postulated fifth basic force of nature (the four known forces of nature are gravity, electromagnetism, and the strong and weak interactions). Proposed in 1986 to account for gravitational...Peregrinus, Petrus
(Encyclopedia)Peregrinus, Petrus (Peter the Pilgrim) pēˈtrəs pĕrəgrĭnˈəs [key], c.1220–?, medieval scholar and soldier. The tutor of Roger Bacon, he wrote the first important study of magnetism, Epistola ...Pacher, Michael
(Encyclopedia)Pacher, Michael mĭkhˈäĕl päˈkhər [key], c.1435–1498, German religious painter and probably a wood carver, a native of the Tyrol. He painted figures reminiscent of the art of Mantegna, whose w...chart
(Encyclopedia)chart, term referring to maps prepared for marine navigation and for air navigation. All charts show, in some convenient scale, geographic features useful to the navigator, as well as indications of d...pen
(Encyclopedia)pen, pointed implement used in writing or drawing to apply ink or a similar colored fluid to any surface, such as paper. Various kinds of pens have been used since ancient times. Reeds that were slit ...color index
(Encyclopedia)color index, in astronomy, difference in an object's brightness as recorded between any two well-defined bands of the electromagnetic spectrum by using optical filters of different colors. If blue and...crucible
(Encyclopedia)crucible, vessel in which a substance is heated to a high temperature, as for fusing or calcining. The necessary properties of a crucible are that it maintain its mechanical strength and rigidity at h...analog circuit
(Encyclopedia)analog circuit, electronic circuit that operates with currents and voltages that vary continuously with time and have no abrupt transitions between levels. Generally speaking, analog circuits are cont...Browse by Subject
- Earth and the Environment +-
- History +-
- Literature and the Arts +-
- Medicine +-
- People +-
- Philosophy and Religion +-
-
Places
+-
- Africa
- Asia
- Australia and Oceania
- Britain, Ireland, France, and the Low Countries
- Commonwealth of Independent States and the Baltic Nations
- Germany, Scandinavia, and Central Europe
- Latin America and the Caribbean
- Oceans, Continents, and Polar Regions
- Spain, Portugal, Italy, Greece, and the Balkans
- United States, Canada, and Greenland
- Plants and Animals +-
- Science and Technology +-
- Social Sciences and the Law +-
- Sports and Everyday Life +-
