Publisher's Synopsis
Excerpt from Observations on Days of Unusual Magnetic Disturbance, Vol. 1: Made at the British Colonial Magnetic Observatories, Under the Departments of the Ordnance and Admiralty; 1840-1841
On a review of the accord which shows itself in the diurnal march of each element in the different months, we may feel justified in regarding the mean monthly positions at the several observation hours as approximate normal positions; and we may view the difference between the actual position at any hour during the month, and the normal position at the same hour, as the effect of disturbing causes.
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