Egon Schweidler, (* February 10, 1873 in Vienna; † Feb. 10, 1948, in Salzburg Seeham) was an Austrian physicist.
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He was born in 1873 as the son of the court and Gerichtsadvokaten Emil von Schweidler born in Vienna. After studying physics and mathematics, he earned his doctorate with a dissertation "On the internal friction of mercury and some Amalgamen" (1985). He was assistant to Franz Exner.
In 1899, he went to the University of Vienna. In 1911 he was appointed as an associate professor. From 1911 to1926, he was the head of the Department of Experimental Physics at the University of Innsbruck, where he was dean in 1924 and rector in 1925/26. In 1926, he returned as per his appeal as an Ordinary II at the Physics Institute of the University of Vienna. There, he also worked as a secretary (1929-1933), Secretary-General (1933-1938), and Vice President (1939-1945) of the Austrian Academy of Sciences. In 1933, he was also elected chairman of the German Physical Society.
From an historical view, his major works in the field of atmospheric electricity should be mentioned. Schweidler's scientific work was recognized very early (1907) with the award of "Baumgartner Prize" of the Vienna Academy of Sciences for the study of the anomalies in the behavior of dielectrics. He pointed (in 1899) with Stefan Meyer, among others, the statistical nature of the radioactive decay or the magnetic deflection of beta radiation as fast electrons. His predicted variations (1905) of the ionization radiation formed in the end a large number of theoretical and experimental investigations.