APPENDIX B 



SUNSPOT NUMBERS * 



Monthly means 



Mean 48.6 56.3 47.4 52.4 56.4 57.8 60.1 61.0 52.0 53.7 53.9 52.1 54.3 



* Authority, W. Biuiincr, Swiss Federal Observatory, Zuricli. 



62s 



