Search

Search results

Displaying 61 - 70

half-life

(Encyclopedia) half-life, measure of the average lifetime of a radioactive substance (see radioactivity) or an unstable subatomic particle. One half-life is the time required for one half of any…

Hogwood, Christopher Jarvis Haley

(Encyclopedia) Hogwood, Christopher Jarvis Haley, 1941–2014, British conductor, musicologist, and harpsichordist, b. Nottingham, grad. Cambridge (1964). He was an leader of the early-music movement,…

assaying

(Encyclopedia) assayingassayingəsāˈyĭng, ăsˈāyĭng [key], in metallurgy, process of determining the specific metallic content of an ore, alloy, or other substance, especially one containing precious…

Evans, Sir Arthur John

(Encyclopedia) Evans, Sir Arthur John, 1851–1941, English archaeologist. He was (1884–1908) keeper of the Ashmolean Museum at Oxford. From 1900 to 1935 he conducted excavations on the Greek island of…

Murrow, Edward Roscoe

(Encyclopedia) Murrow, Edward Roscoe, 1908–65, American news broadcaster, b. Greensboro, N.C. He joined the Columbia Broadcasting System (CBS) in 1935 and became its European director two years later…

Boston Strangler

(Encyclopedia) Boston Strangler, American serial killer who terrorized the Boston, Mass., area during a killing spree (Jun., 1962–Jan, 1964) that claimed the lives of at least 11 women. The first six…

spectroscope

(Encyclopedia) spectroscope, optical instrument for producing spectral lines and measuring their wavelengths and intensities, used in spectral analysis (see spectrum). When a material is heated to…

Remington, Frederic

(Encyclopedia) Remington, Frederic, 1861–1909, American painter, sculptor, illustrator, and writer, b. Canton, N.Y., studied at the Yale School of Fine Arts and the Art Students League. His subjects…

annual rings

(Encyclopedia) annual rings, the growth layers of wood that are produced each year in the stems and roots of trees and shrubs. In climates with well-marked alternations of seasons (either cold and…

Memling, Hans

(Encyclopedia) Memling or Memlinc, HansMemling or Memlinc, Hanshäns mĕmˈlĭng, –lĭngk [key], c.1430–1494, Flemish religious and portrait painter, b. Germany. He may have studied with Roger van der…