Sunspot Observations and Counting at Specola Solare Ticinese in Locarno   since 1957
  Specola Solare Ticinese is an observatory dedicated to Sunspot Number counting, which was constructed in 1957 in Locarno, Southern Switzerland, as an external observing station of the Zurich Federal Observatory. When in 1981 the responsibility of the determination of the International Sunspot Number was assumed by the Royal Observatory of Belgium, Specola Solare Ticinese was given the role of pilot station, with the aim of preserving the continuity in the counting method. We report the observing procedure and counting rules applied in Locarno. 
Sergio Cortesi, Marco Cagnotti, Michele Bianda, Renzo Ramelli and   Andrea Manna
astro-ph.SR