From 1926 until 1945 he was the director of the Swiss Federal Observatory. He continued the series of Zurich sunspot observations that was begun in 1864 by the observatory founder, Rudolf Wolf. (These observations continue up to the present.)
From Politics to Reason of State: The Acquisition and Transformation of the Language of Politics, 1250-1600.
Jun 22, 1994; Maurizio Viroli. (Ideas in Context, 22.) Cambridge: Cambridge University Press, 1992. x + 331 pp. $54-95. These two recent books...