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monitorial system
(Encyclopedia)monitorial system, method of elementary education devised by British educators Joseph Lancaster and Andrew Bell during the 19th cent. to furnish schooling to the underprivileged even under conditions ...Cherenkov, Pavel Alekseyevich
(Encyclopedia)Cherenkov, Pavel Alekseyevich päˈvĭl əlyĭksyāˈyəvĭch chərĕngˈkəf [key], 1904–90, Soviet physicist. He shared with the Soviet physicists I. M. Frank and I. Y. Tamm the 1958 Nobel Prize i...sandblast
(Encyclopedia)sandblast, stream of sand or other abrasive particles driven by a jet of compressed air or water or by centrifugal force against a surface to clean or abrade it. When centrifugal force is used, the ab...Felton, William Harrell
(Encyclopedia)Felton, William Harrell, 1823–1909, American political leader, b. Oglethorpe co., Ga. After studying medicine he practiced for awhile, but gave it up for farming in 1847. Ordained a Methodist minist...delta
(Encyclopedia)delta [from triangular shape of the Nile delta, like the Greek letter delta], a deposit of clay, silt, and sand formed at the mouth of a river where the stream loses velocity and drops part of its sed...Geiger counter
(Encyclopedia)Geiger counter or Geiger-Müller (G-M) counter gīˈgər-mŭlˈər, –myo͞oˈlər [key], instrument for the detection and quantitative determination of ionizing radiation such as the alpha and beta ...Dehmelt, Hans Georg
(Encyclopedia)Dehmelt, Hans Georg häns gāˈôrkh dāˈməlt [key], 1922–2017, German-American physicist, b. Gorlitz, Germany, Ph.D. Univ. of Göttingen, 1950. A professor at the Univ. of Washington in Seattle, ...Hahn, Otto
(Encyclopedia)Hahn, Otto ôˈtō hän [key], 1879–1968, German chemist and physicist. His important contributions in the field of radioactivity include the discovery of several radioactive substances, the develop...Keeler, James Edward
(Encyclopedia)Keeler, James Edward, 1857–1900, American astronomer, b. La Salle, Ill. At the age of 21 he went on the Naval Observatory expedition to Colorado to observe the solar eclipse of July, 1878. In 1886 h...Carman, Harry James
(Encyclopedia)Carman, Harry James, 1884–1964, American historian and educator, b. Greenfield, Saratoga co., N.Y. He was a elementary-school teacher and a high-school principal before becoming an instructor and th...Browse by Subject
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