Page 452 - 89 history of astronomy_opt

nich, found a decennial period in the daily
range of magnetic declination. In 1852 Sir
Edward Sabine announced a similar period
in the number of ”magnetic storms” affect-
ing all of the three magnetic elements–declination,
dip, and intensity. Australian and Cana-
dian observations both showed the decen-
nial period in all three elements. Wolf, of
Zurich, and Gauthier, of Geneva, each inde-
452