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cat's-eye

(Encyclopedia)cat's-eye, gemstone that displays a thin band of reflected light on its surface when cut as a cabochon. Its name is derived from its supposed resemblance to the eye of a cat. The optical effect, known...

Abbot, Charles Greeley

(Encyclopedia)Abbot, Charles Greeley, 1872–1973, American astrophysicist, b. Wilton, N.H. He was acting director in 1896 and director in 1907 of the astrophysical observatory of the Smithsonian Institution; he wa...

Montero Ríos, Eugenio

(Encyclopedia)Montero Ríos, Eugenio āo͞ohāˈnyō mōntāˈrō rēˈōs [key], 1832–1914, Spanish statesman and jurist. He was professor of canon law at the universities of Oviedo, Santiago, and Madrid. He ent...

Lange, Friedrich Albert

(Encyclopedia)Lange, Friedrich Albert frēˈdrĭkh älˈbĕrt längˈə [key], 1828–75, German neo-Kantian philosopher. He accepted the materialistic method of investigating phenomena but rejected its concept of ...

Krogh, Schack August Steenberg

(Encyclopedia)Krogh, Schack August Steenberg shäk ouˈgo͝ost stānˈbĕrg krôkh [key], 1874–1949, Danish physiologist. He taught at the Univ. of Copenhagen (1916–45) and studied respiration, circulation, and...

aureole, in physics

(Encyclopedia)aureole ôrˈēōlˌ [key], in physics, luminous circle seen when the sun or other bright light is observed through a diffuse medium, i.e., smoke, thin cloud, fog, haze, or mist. It sometimes occurs a...

Richardson, Sir Owen Willans

(Encyclopedia)Richardson, Sir Owen Willans, 1879–1959, British physicist, Ph.D. University College, London, 1904. He was a professor at Princeton from 1906 to 1913 and at King's College London from 1914 until his...

damascening

(Encyclopedia)damascening –skēnˈ– [key], the art of decorating iron, steel, or bronze with inlaid threads of gold or silver, or producing a watered effect in forging, as in sword blades, gun barrels, and vari...

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...

Olitski, Jules

(Encyclopedia)Olitski, Jules ŏlĭtˈskē [key], 1922–2006, American painter, b. Russia as Jevel Demikovsky. While considered a color-field painter (see color-field painting), Olitski produced works that are free...