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The daily variation of the horizontal needle is a subject which has, for nearly a century, attracted the attention of several accurate observers, whose object was principally limited to determining the hour of the day, when its amount was the greatest, and the times of the needle's successive easterly and westerly motions.

VI. Observations on the diurnal changes in the position of the horizontal needle, under a reduced directive power, at Port Bowen, 1825.