Abstract
At the Apia Observatory the north pole of the magnet rises, so that vertical intensity is negative. The practice adopted to facilitate tabulation is to disregard signs, and in this way the reading which has the largest numerical value is called the maximum. The hourly values of vertical intensity, Z, are computed in the same manner as those of horizontal intensity, H, and of declination, D, namely from the mean ordinate to the curve during the entire period of 60 minutes commencing at the hour of Greenwich mean time stated. In the harmonic analysis the notation is
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