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Dumba, Konstantin Theodor

(Encyclopedia)Dumba, Konstantin Theodor kônstäntēnˈ tāˈōdôr do͝omˈbä [key], 1856–1947, Austro-Hungarian diplomat. As ambassador (1913–15) to the United States, he was involved with Franz von Papen an...

De la Rue, Warren

(Encyclopedia)De la Rue, Warren dĕlˈəro͞o, dĕləro͞oˈ [key], 1815–89, British scientist and inventor. Especially noted as an astronomer, he was a pioneer in celestial photography. He adapted the wet-plate ...

Maskelyne, Nevil

(Encyclopedia)Maskelyne, Nevil măsˈkəlīn [key], 1732–1811, English astronomer. Maskelyne received his education at Westminster School and Trinity College, Cambridge. Appointed astronomer royal at the Royal Ob...

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...

Rodgers, John, 1812–82, American naval officer

(Encyclopedia)Rodgers, John, 1812–82, American naval officer, b. Harford co., Md.; son of John Rodgers. He became (1828) a midshipman and saw varied service. He conducted (1852–56) exploring expeditions in the ...

ultraviolet astronomy

(Encyclopedia)ultraviolet astronomy, study of celestial objects by means of the ultraviolet radiation they emit, in the wavelength range from about 90 to about 350 nanometers. Ultraviolet (UV) line spectrum measure...

X-ray astronomy

(Encyclopedia)X-ray astronomy, study of celestial objects by means of the X rays they emit, in the wavelength range from 0.01 to 10 nanometers. X-ray astronomy dates to 1949 with the discovery that the sun emits X ...

Grayson, Cary Travers

(Encyclopedia)Grayson, Cary Travers, 1878–1938, American naval officer and surgeon, b. Culpeper co., Va. As a physician he entered (1903) the U.S. navy, was graduated (1904) from the navy medical school, and afte...

Aso-san

(Encyclopedia)Aso-san äˈsō-sän [key] or Mount Aso, volcanic mountain, central Kyushu, Japan. Aso-san is topped by one of the world's largest calderas (circumference 75 mi/121 km) that contains five volcanic con...

Vakhtangov, Yevgeni

(Encyclopedia)Vakhtangov, Yevgeni yĭvgāˈnyē väkhtänˈgôf [key], 1883–1922, Russian actor, producer, and founder of the Moscow theater that bears his name. A pupil and friend of Stanislavsky, Vakhtangov joi...