On the discovery of the pion, besides the other works cited in this chapter, also see [28,29]. Bernardini became Chair Pro- fessor and, after one year in Camerino, settled in Bologna, where he was director of that Physical Institute till They obtained only doubles coincidences and the method was very cumbersome. By systematically analysing the curvature, range and ionization, they eliminated many other likely hypotheses and obtained evidence supporting the existence of positive electrons. A few years later, a small astronomical observatory later known as la Specola and a room for meteorological measurements were added.
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