Fig. 1(A). Magnetic observatories, Western Hemisphere 



KEY. EUROPEAN OBSERVATORIES 

 I — RudeSkw 6-Uaie 

 2— Hel 7— valJoyeiw 



3— OeBiit 8— Aohof 



4— Niemegk 9— Msisach 

 5— Bochum 10— Caslellaccio 

 l-Konigsberg 

 I2-Regen5bef6 

 Steparwwka 



Fig. 1(B). Magnetic observatories, Eastern Hemisphere 



49 



