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1906–88, German electrical engineer. By applying the discovery that electron waves are 100,000 times shorter than those of light, Ruska built a micr...
1866–1959, American educator, b. Louisville, Ky., grad. Johns Hopkins Univ., 1886. After 19 years as a secondary school teacher and principal, he to...
1796–1878, British explorer in N Canada. He accompanied Sir John Franklin on arctic expeditions in 1818, 1819–22, and 1824–27. On an expedition ...
(Tiberius Julius Caesar Augustus) (t b r´ s) (KEY) , 42 B.C.–A.D. 37, second Roman emperor (A.D. 14–A.D. 37). He was the son of Tiberius Claudiu...
(fr ´b l, fr ´–, Ger. fr ´dr kh v l´h lm ou´g st frö´b l) (KEY) , 1782–1852, German educator and founder of the kindergarten system. He had...
( ´r kh f n dr gäl´sk ) (KEY) , 1865–1949, German polar explorer. A professor of geography at the Univ. of Munich, he led an expedition that wint...